Overlaying a product with CF (questions)

General Composites Discussions Composites Talk
#1

Gents,

Here’s what I’ve got…I have a urethane lip that was on the front end of my car (maxima) and due to the brutal winter we had this year, the freaking urethane cracked during the aftermath of a snow storm (hit a patch of ice)

I would like to repair the lip and figure that I could take the opportunity to overlay it with CF. What do I need to do to get a painted lip ready for a CF overlay?

I’ve been lurking here for sometime and will now actually go and read up on the stuff… Any insight would be greatly appreciated.

Thanks,

oekundar

#2

well you are working with the worst material to overlay over. Urethane does not adhear to resin in the least. You would need to sand it down and do a layer or 2 of fiberglass over the lip. Then you would overlay onto of the fiberglass. So if it does come apart you would still have the fiberglass to hold it’s shape

#3

Interesting…well that sucks…now the lip is currently painted would it behove me to leave the paint on and try adhering to that?

#4

no because resin make a chemical reaction with the clear coat on them and you could bubble the clear coat under it and again make it lift

#5

OK…I get you…I will be stripping the lip down and sanding it a bit…then laying a layer of glass prior to the layer of CF…hopefully that works out as planned

#6

Ya. ditto on the paint problem. I have had several instances when making a mold from a piece with an auto finish on it bubble the surface. I was always careful to make sure the exotherm did not get too hot by building several layers at the same time. Whenever possible, it is probably safest to just have a clean, primer surface that has your desired finish quality.