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Q: Do I have to lightly sand/do anything to the small rust spots before applying? I’m not sure what ‘kills old rust’ means and how it affects paintwork.

No, you don’t have to sand it, just brush off loose dirt. A layer of dust helps key it to the metal. It doesn’t harm the paint, but does tend to creep up the face of the paintwork, so needs wiping off occasionally. The creeping is good as it gets into all the nooks and crannies.

Q: Hi. i'd like to use this on an old prefab garage roof frame(where appearance dosen't matter) it,s vv badly rusted, would it work. thanks

Hi Silverback....The inside surfaces of my LandRover doors were quite rusty; clearing as much of the loose matter and debris certainly helps with the adhesion of the Waxoyl and one year on it appears to be doing the job. I would imagine a similar approach to your roof would be advisable. Regards. John Marino.

Q: Would this be suitable for painting a raw steel bike frame ? How is it best applied and it will it leave a smooth clear coat finish? Thanks

Waxoyl is not a transparent paint and would not be suitable for application to a bicycle frame. It has a gooey consistancy similar to runny jam or thick cream when being applied and stays flexible for long periods. It is superb for protecting steel items subjected to adverse, wet conditions such as motor car underside mechanical components. I use a hand spray gun or paint brush for application. Not suitable for human contact after application; it becomes messy if handled and would not be kind to clothing. Try a high quality enamel paint over a good metal primer.

Q: Would it be advisable to spray the underside of my caravan which is thick ply with fixed metal attachments like corner steadies, motor mover drive etc

Hi, metal ,yes. Even rust, Ply needs to breath.

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🛠️ Protect your ride like a pro—rust doesn’t stand a chance!

INVISIBLE ARMOR - Clear finish lets your car’s original look shine while protecting hidden areas.
TRUSTED CLASSIC CARE - The original rustproofing formula favored by vintage and modern car enthusiasts alike.
ULTIMATE RUST DEFENSE - Kills existing rust and prevents new corrosion for lasting vehicle care.
COMPREHENSIVE COVERAGE - Perfect for doors, panels, chassis, and all water-prone spots to stop rust at its source.
WEATHERPROOF FLEXIBILITY - Forms a durable, flexible skin that resists cracking, drying, and rain wash-off.

Hammerite Waxoyl Car Underseal is a 5L clear rust treatment refill that kills existing rust and prevents new rust formation by creating a flexible, weatherproof protective layer. Ideal for application on hidden car parts prone to moisture, it ensures long-lasting rustproofing without cracking or washing away, making it the go-to solution for classic and modern car maintenance.

Have a Question? See What Others Asked

Do I have to lightly sand/do anything to the small rust spots before applying? I’m not sure what ‘kills old rust’ means and how it affects paintwork.

Hi. i'd like to use this on an old prefab garage roof frame(where appearance dosen't matter) it,s vv badly rusted, would it work. thanks

Would this be suitable for painting a raw steel bike frame ? How is it best applied and it will it leave a smooth clear coat finish? Thanks

Would it be advisable to spray the underside of my caravan which is thick ply with fixed metal attachments like corner steadies, motor mover drive etc

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Manufacturer	Hammerite Products ICI Ltd.
Part Number	5092941
Product Dimensions	17.6 x 11 x 30.6 cm; 4.39 kg
Item model number	5092941
Size	5 Litre
Colour	Refill Can
Item Package Quantity	1
Included Components	Refill Can
Batteries included?	No
Batteries Required?	No
Item Weight	4.39 kg

Hammerite Waxoyl Car Underseal and Rust Protection. The Original Rustproofing for Cars, Rust Inhibitor and Rust Converter for Classic Car Care. Waxoyl Clear 5L Refill Can

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