What Is Silicone Spray?
Silicone spray is an aerosol lubricant that deposits a thin film of silicone polymer onto a surface. The carrier solvent evaporates after application, leaving behind a clear, non-greasy film that reduces friction, repels water and dust, and keeps rubber and plastic components from cracking, sticking or squeaking.
It's easy to confuse with silicone sealant (the gap-filling paste used around sinks and in gasket-making) purely because both share the name "silicone" — but they're unrelated products doing unrelated jobs. If you're after a gap-filling or gasket-forming silicone, see our RTV Silicone Gasket Maker Guide instead. This guide is about the lubricant spray.
What silicone spray is not
Three products get confused with silicone spray lubricant because they share a word or a shelf. It's worth being clear on the difference before you buy:
- Silicone sealant / RTV silicone: A paste, not a spray — cures into a flexible rubber gasket or seal. See the RTV Silicone Gasket Maker Guide.
- Silicone sealant remover: Formulated to soften and lift cured silicone sealant off a surface. It does the opposite job to a silicone lubricant spray and won't lubricate anything.
- Dry PTFE spray: A different chemistry (PTFE particles, not silicone polymer) aimed at similar jobs — cables, locks, dusty environments. See the comparison further down this guide.
How Silicone Spray Works
Once the carrier solvent flashes off, what's left is a thin silicone polymer film with a specific set of properties that make it a poor substitute for a general-purpose oil, and a very good choice for a narrower set of jobs:
- Petroleum-free: Contains no petroleum distillates, so it doesn't attack rubber, vinyl or most plastics the way an oil-based penetrant can.
- Non-greasy, dust-repelling: The cured film doesn't stay tacky, so it doesn't collect grit and grime the way an oily film does.
- Wide service temperature range: Silicone lubricants are generally rated across a very wide temperature band — commercial-grade silicone spray products are commonly rated from around -40°C up to +200°C, well beyond what a petroleum-based lubricant can handle before it breaks down or thins out. Always check the specific product's technical data sheet, since the exact range varies by formulation.
- Water-resistant: Repels moisture and helps stop rubber components drying out, cracking or perishing from UV and ozone exposure.
- Low film strength: The trade-off for all of the above — the silicone film isn't built to carry load. It's a friction-reducer and protectant, not a grease substitute for anything metal-on-metal under pressure.
Best Applications for Silicone Spray
| Application | Why silicone spray works here |
|---|---|
| Rubber door and window seals | Keeps rubber supple, stops it sticking or perishing, no oil staining on the rubber or surrounding paint |
| Sliding door and window tracks/runners | Safe on aluminium, rubber and plastic track components; reduces friction without attracting grit |
| Conveyor belts and treadmill belts | Standard lubricant for belt-on-deck friction where oil contamination isn't acceptable |
| Rubber O-rings and seals (assembly) | Safe assembly lubricant for most EPDM, neoprene and Viton rubber — check compatibility for specific elastomers |
| Zips, especially on PPE, tents and marine gear | Frees stiff zip sliders without the oil staining fabric |
| Plastic-on-plastic sliding parts | No petroleum solvent to craze or stress-crack the plastic |
| Squeaky hinges on light, non-load-bearing fittings | Quick fix where a full grease service isn't practical |
| Mould release for rubber and plastic casting | A well-established, purpose-sold use in its own right — a light silicone film lets cured rubber, resin or plastic release cleanly from a mould without bonding to it. AIMS stocks a dedicated food-grade silicone mould release spray for exactly this job |
| Waterproofing boots, PPE rainwear and outdoor gear | A light coat on leather or synthetic outer surfaces helps bead water without clogging the material's breathability the way a wax-based product can — see AIMS's Safety Equipment & PPE range for the gear itself |
| Food-grade applications (with an NSF H1 product) | Purpose-built food-grade silicone sprays are registered for incidental food contact — see the food-grade section below |
Where Silicone Spray Should Not Be Used
- Surfaces to be painted or adhesive-bonded: This is the big one. Even a light overspray of silicone contamination will cause paint to fish-eye and stop adhesives from bonding properly, and it's genuinely difficult to fully remove once it's contaminated a surface. Keep silicone spray well away from any area that's going to be painted, panel-repaired or glued — including nearby surfaces that overspray can drift onto. This is a pre-paint contamination risk specifically — it's not a warning against using silicone spray near already-cured, intact paintwork, which the film sits on inertly and doesn't damage.
- Electrical switches, relays and connector contacts: This one is more specific than "silicone spray is bad for electronics" — the actual mechanism, per switch manufacturer OMRON's own guidance, is that silicone vapour or residue near a contact reacts with the heat of the switching arc and forms a silicon dioxide deposit directly on the contact surface, which causes intermittent connection or contact failure over time. It's a real, well-documented failure mode in switches and relays that make and break a circuit — not an issue for a sealed cable gland or a connector boot that never arcs. If you're protecting a sealed, non-switching connection from moisture, that's a different job — see our Penetrating Oil & Spray Lubricants Guide for corrosion inhibitor options. If you're lubricating or protecting anything with switching contacts, don't use silicone spray on or near it.
- Load-bearing metal-on-metal contact: Silicone film doesn't have the film strength to protect a loaded bearing, gear mesh or heavily loaded pivot. Use a proper grease — see our Grease Selection Guide.
- Surfaces you intend to walk on, or foot/hand controls: A silicone film is genuinely slippery. Don't spray it onto a step, a ladder rung, a ute tray, a pedal or anything where extra slip is a safety hazard rather than a feature.
- Woodworking surfaces headed for staining, finishing or gluing: Same contamination problem as paint — silicone residue causes fish-eyeing in stains and finishes and stops glue from bonding.
Removing Silicone Spray Overspray and Contamination
Overspray happens — a light mist drifts further than intended, or a can gets used near a surface that turns out to matter. What to do about it depends on whether the product is still wet, whether the surface is headed for paint, or whether it's landed on a floor.
Wet overspray
Wipe it up immediately with a rag while it's still wet. Once the carrier solvent flashes off and the film cures, silicone residue is genuinely difficult to fully remove — it's far easier to catch before that happens than after.
A surface that's about to be painted
Don't paint over it and hope for the best — even minor, invisible contamination causes fish-eyeing or stops the new paint bonding properly. Degrease the area thoroughly with a dedicated silicone-contamination remover, or a strong degreaser from AIMS's Detergents & Cleaners range, and consider a light sand on a critical panel or surface before painting to be certain all contamination is gone.
Overspray on a floor — treat it as a slip hazard
A silicone film on a floor is genuinely slippery, so don't just wipe it with water — that tends to spread a thin film further rather than lifting it. Lay down an absorbent (sand, cat litter or a proprietary absorbent) on any wet product first, then clean the area with a degreasing detergent and hot water, working it in and rinsing thoroughly. Test the surface underfoot before reopening it to foot traffic, and repeat the degreasing pass if it still feels slick.
Silicone Spray vs WD-40 and Penetrating Oil
This is one of the most common mix-ups in an Australian workshop, and it goes both ways — people reach for WD-40 on a rubber seal that needed silicone, and reach for silicone spray on a rusted bolt that needed a real penetrant.
| Silicone spray | WD-40 / penetrating oil | |
|---|---|---|
| Base chemistry | Silicone polymer film | Petroleum solvent + light mineral oil |
| Penetrates rust and frees seized fasteners | No — not formulated for this | Yes, to varying degrees by product |
| Safe on rubber, vinyl, most plastics | Yes | Limited — petroleum solvents can degrade some rubber and craze some plastics |
| Leaves a lasting protective film | Yes | Only the Specialist/dedicated long-term products — WD-40 Original evaporates |
| Safe before painting | No — contaminates the surface | Also no, for the same reason, though generally easier to clean off first |
| Dust and grit attraction | Low — non-greasy film | Higher — oil-based film attracts grit |
Is WD-40 a silicone spray? No — WD-40 Original is a petroleum-based water-displacing penetrant, not a silicone product. WD-40 does make a dedicated Specialist Silicone spray as a separate product in its range, which is a genuine silicone lubricant in its own right. For the full picture on WD-40, CRC 5-56, INOX and where each one actually belongs, see our Penetrating Oil & Spray Lubricants Guide.
Silicone Spray vs Dry PTFE Spray
Both are non-oily, non-staining lubricants, and both get reached for in similar jobs — the choice comes down to what's on the other side of the contact.
| Silicone spray | Dry PTFE spray | |
|---|---|---|
| Film type | Thin, slightly tacky silicone film | Dry, powder-like PTFE film — no residue feel |
| Best on | Rubber, vinyl, painted or plastic surfaces, seals | Cables, locks, dusty or dirty environments |
| Dust/grit pickup | Low | Very low — genuinely dry film |
| Water resistance | Good | Moderate — washes off more readily |
For cables, padlocks and anything working in a genuinely dusty or dirty environment, a dry PTFE spray is usually the better call — see our Teflon (PTFE) Spray Guide for the full picture on wet vs dry PTFE and where it earns its keep. For rubber seals, tracks and belts, silicone spray is the standard choice.
Food-Grade Silicone Spray
Standard silicone spray is not automatically food-safe — check the specific product. Food-grade silicone sprays are separately formulated and registered, most commonly to NSF H1 (incidental food contact) standard, which also satisfies FDA and USDA requirements referenced in Australian HACCP-accredited food processing and packaging environments.
NSF H1 registration matters because it confirms the specific formulation has been assessed as safe for incidental contact where food is processed, packed or handled — using a non-food-grade silicone spray in that environment is a genuine compliance gap, not just a technicality. AIMS stocks purpose-built NSF H1 food-grade silicone spray options — see the AIMS Supply section below.
How to Apply Silicone Spray
- Shake the can thoroughly before use, and work at room temperature where practical — cold cans spray less evenly.
- Mask or move away anything nearby that shouldn't get overspray — paintwork, anything due to be glued, and any switching electrical contacts as covered above.
- Hold the can roughly 200–250mm from the surface and apply a light, even coat rather than saturating the area. A thin film is all the product is designed to leave.
- Work the part through its full range of motion (a hinge, a track, a zip) once coated, to spread the film into the contact surfaces.
- Wipe off excess from anywhere it isn't needed, particularly if the surrounding area will later be painted or glued.
- Allow the carrier solvent to flash off before putting the part back into service around anything electrical or before it needs to bear load.
Shop Silicone Spray at AIMS Industrial
AIMS Industrial stocks silicone spray lubricants across standard, extreme-duty and food-grade (NSF H1) formulations, from WD-40, CRC, Molytec, Rocol and Helmar:
- WD-40: Specialist Silicone Lubricant aerosol, and the High Performance Silicone Lubricant with Smart Straw applicator.
- CRC: Standard multi-purpose silicone spray, an Extreme Duty Silicone Lubricant aerosol, and two food-grade NSF H1 formulations — a water-based option and a standard aerosol — for HACCP and food-contact environments.
- Molytec: The M808 Spraysafe food-grade silicone spray aerosol, and the M815 silicone lubricant in bulk pail format for high-volume use.
- Rocol: Silicone Lubricant Spray aerosol, from the UK industrial brand with strong Australian trade distribution.
- Helmar: High Performance Silicone Spray, available in aerosol and bulk formats.
Browse AIMS Industrial's Silicone Spray range →
For the full picture on penetrating oils, chain lube and where each one actually belongs, see our Penetrating Oil & Spray Lubricants Guide. For dry-film and wet PTFE spray, see our Teflon (PTFE) Spray Guide. For grease selection where a loaded, metal-on-metal contact needs a real film-strength lubricant, see the Grease Selection Guide. For gap-filling or gasket-forming silicone rather than the lubricant spray, see the RTV Silicone Gasket Maker Guide.
Frequently Asked Questions
What is silicone spray used for?
Silicone spray is used to lubricate and protect rubber, plastic and painted surfaces without the drawbacks of an oil-based lubricant. Typical uses include rubber door and window seals, sliding tracks and runners, conveyor and treadmill belts, zips, and plastic-on-plastic contact points. It leaves a non-greasy, water-resistant film that doesn't attract dust or grit the way an oil-based product does.
Is WD-40 a silicone spray?
No. WD-40 Original is a petroleum-based water-displacing penetrant, a different chemistry to a silicone lubricant. WD-40 does sell a separate Specialist Silicone spray, which is a genuine silicone product, but the original blue-can WD-40 is not silicone-based.
Is silicone spray good for rubber, or does it damage rubber?
Silicone spray is generally good for rubber — it's petroleum-free, so it doesn't cause the swelling or degradation that an oil-based product can cause in many rubber compounds, and it helps keep rubber seals supple and resistant to cracking from UV and ozone exposure. It's one of the standard-recommended lubricants for rubber seals, O-rings and weatherstripping for that reason.
Can silicone spray be used on plastic, including clear polycarbonate?
Yes, generally. Silicone-based lubricants are commonly recommended as a safe choice on plastics — including clear polycarbonate, which is prone to stress-cracking from mineral oils and solvent-based products but is not flagged as a problem material for silicone. As always, test on an inconspicuous area first if the plastic type or finish is unknown, and check the specific product if the application is critical.
How long does silicone spray take to dry or cure?
The carrier solvent typically flashes off within minutes of application, leaving the silicone film behind — but the exact time varies by product and by ambient conditions (temperature, airflow, coating thickness). Apply a thin, even coat rather than saturating the surface, and allow a few minutes before putting the part back into service, longer in cold conditions or if a heavier coat was applied.
What temperature range can silicone spray handle?
It varies by product, but commercial and trade-grade silicone spray lubricants are commonly rated across a very wide band — from around -40°C up to +200°C on professional-grade formulations — well beyond what a petroleum-based lubricant can handle before it breaks down. Check the specific product's technical data sheet for its exact rated range rather than assuming.
Can silicone spray be used on locks and padlocks?
It can, but it's not the first choice. A dry PTFE or graphite-based lubricant is generally the better option for lock mechanisms, since it won't leave any residue for dirt and grit to stick to inside the pin tumblers over time. Silicone spray is a reasonable second option if that's what's on hand, but avoid oil-based lubricants in locks altogether — they gum up the mechanism. See AIMS's Padlocks range if you're after the lock itself.
Can I use Vaseline or petroleum jelly instead of silicone spray?
Not as a general substitute. Petroleum jelly is petroleum-based, so it carries the same rubber-compatibility risk as other petroleum products — it can cause swelling or degradation in some common rubber compounds over time, where silicone spray is formulated to be petroleum-free and broadly rubber-safe. Petroleum jelly also has no useful spray application and won't reach tracks, seals or belts the way an aerosol will. For a genuine rubber- and plastic-safe lubricant, use a proper silicone spray.
Is silicone spray flammable, and how should it be stored?
Yes — like most aerosol lubricants, silicone spray contains a pressurised, flammable propellant. Store cans upright in a cool, dry area away from direct sunlight and ignition sources, and don't exceed the can's rated temperature limit (commonly 50°C). Allow aerosol vapour to clear before working near live electrical equipment, and don't apply near open flames, welding arcs or grinding sparks.
Can silicone spray be used as a mould release agent?
Yes — this is a genuine, well-established industrial use in its own right, not just a workaround. A light coat of silicone spray on a mould surface lets cured rubber, resin or plastic release cleanly without bonding to the mould. Purpose-made silicone mould release sprays are sold specifically for this job, and it's a different use case to lubricating a moving mechanical part.
Is silicone spray good for waterproofing boots and outdoor gear?
Yes, as a light water-repellent treatment for leather or synthetic outer surfaces — it helps beading without the heavier build-up of a wax-based dressing. It's not a substitute for a purpose-made leather conditioner on good boots, and it's not for anything that needs to stay grippy underfoot, since the film does reduce surface traction.
Is silicone spray toxic, or safe to use around food?
Standard silicone spray isn't formulated or registered as food-safe, and shouldn't be used around food, food-contact surfaces or food-processing equipment. For that, use a specific NSF H1-registered food-grade silicone spray — see the food-grade section above. Outside food-contact use, follow standard aerosol handling precautions: use in ventilated areas and avoid inhaling the spray mist, as with any aerosol product.
How long does silicone spray last once applied?
There's no fixed figure — it depends on the surface, how much wear or washing it's exposed to, and outdoor UV and weather exposure. As a general guide, silicone spray on an indoor, low-wear application (a door track, a zip) can protect for months, where an outdoor or frequently washed surface will need more regular reapplication. It doesn't have an expiry as such — it simply wears or washes off over time and needs topping up.
Will silicone spray damage adhesive or remove sticker residue?
It's not the right tool for this job. Silicone spray doesn't contain a solvent capable of dissolving adhesive the way WD-40 or a dedicated adhesive remover does — it's more likely to leave its own residue on top of the adhesive than lift it off. For sticker or adhesive residue, use WD-40 or a purpose-made adhesive remover instead; see our Penetrating Oil & Spray Lubricants Guide.
Will silicone spray stop a squealing engine belt?
Don't use it for this. Belt dressing and silicone spray on a serpentine belt is an old habit that modern belt and vehicle manufacturers (including Gates, Dayco and Continental) explicitly warn against — it can soften and degrade modern EPDM belt rubber, attracts grit that accelerates wear, and masks the real cause of the noise (a worn belt, a weak tensioner, or pulley misalignment) rather than fixing it, often making the noise worse over time as grime builds up. A squealing belt should be diagnosed and the actual cause fixed, not sprayed.
How do I remove silicone spray overspray, and can I paint over a contaminated surface?
Wipe up wet overspray immediately with a rag — once the film cures, it's genuinely difficult to fully remove. Don't paint over a contaminated surface without degreasing it thoroughly first (a dedicated silicone-contamination remover or a strong degreaser), plus a light sand on a critical surface — even minor residue causes fish-eyeing or stops the new paint bonding properly. If overspray has landed on a floor, treat it as a genuine slip hazard: absorb any wet product first (sand, cat litter or a proprietary absorbent), then clean with a degreasing detergent and hot water, working it in and rinsing thoroughly, and test underfoot before reopening the area to traffic. See the "Removing Silicone Spray Overspray and Contamination" section above for the full walkthrough.