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Wing paint and undercoat


bcrain

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1.   I damaged an old style rear wing. I can find one, but it has to be painted to match. Can paint look close enough to the others that are just the coloured fibreglass to be ok?

2.   The front wings have some star cracks from rock hits on the underside. There are many rubber type coatings that could be used to prevent this. Any recommendations for specific products to use?

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I don't have clamshells so have no idea how common this rock damage problem is.  I did have a look at a conventional rear wing recently, and found that an assumed road rock attack was something else. Do each of your star cracks show stress lines emanating radially from clear centre point?  If the stress lines are more of a mosaic type pattern that may be something other than impact damage.  Also, you may want to get a good magnifying glass and look at the centre of any star cracks from the top side.  If the cracks have been caused by something being dropped from the top down you should be able to see that.

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There used to be a product called Rubbercoat by a company called Carlife, specificially sold to paint inside GRP wings.  It was a moisture curing rubber coating that stank!  But 15 years of continual use and I had no starcracks in any of the wings.

Replacing the wings due to accident damage, I painted the inside of them with Isoflex liquid rubber roofing sealant (bought from Screwfix) - also a moisture curing rubber compound - doesn't stink quite the same though.  Three years use and the wings still seem star-crack free.  The stainless steel protectors and the outer edges of the wings are sand blasted from all the grit kicked up on the back roads I use, so they inside must have had a similar battering.

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  • 5 months later...

In the end I had a body shop do all four wings (patched, painted and undercoated with a US brand pick up bed liner product). The bedliner came out way thinner than I planned so I hope it works out. I also had the exhaust treated with that silver ceramic high temp coating. It is awesome with the polished aluminum sides. Finally, I ditched the "sand blasted" SS rear wing protectors in favor of clear polyurethane protection film. The car looks way better.

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I've painted roofing mastic to the underside of the wings. It's cured to a thick firm and slightly soft finish and should (hopefully) protect against flying debris. All seems fine after 1800 miles. It doesn't look particularly nice as it goes on thick and gloppy but at £10 a tin I don't think you can go wrong.

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I've painted roofing mastic to the underside of the wings. It's cured to a thick firm and slightly soft finish and should (hopefully) protect against flying debris. All seems fine after 1800 miles. It doesn't look particularly nice as it goes on thick and gloppy but at £10 a tin I don't think you can go wrong.

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