Painting underside of car.

[jtfx6552]

Epoxy being so nice to sand led me to paint over with single stage. I was concerned the epoxy would get scratched with rocks and the like.

 

[Lizer]

Epoxy being so nice to sand led me to paint over with single stage. I was concerned the epoxy would get scratched with rocks and the like.

The epoxy would fare better than single stage. After fully cured (about 3 months) the epoxy gets pretty hard.

 

[Lizer]

Is that common in automotive refinish? I've never heard of it being used. And is it necessary? Doesn't epoxy provided all the protection realistically that a vehicle needs? I can see using something like that in a saltwater boat or environment but being that it's not common for refinish tells me there is no need for it. Your opinion?

My opinion is nothing beats it for frames, engine bays, suspension, etc. I also use it for farm equipment, trailers, etc.

A garage Queen probably doesn’t need it but daily driver in the rust belt would definitely benefit.

That being said, black epoxy is great too. I wanted to do the frame of the 70 F250 I’m finishing up in black epoxy but I ran out of warm so had to use silver MCU with an industrial black single stage. Far less convenient because more coating steps, longer dry times. But man that combo is durable. And overspray won’t stick to it, just wipes off with thinner.

I’d actually prefer the black epoxy because 3 coats and you’re done. The underside of the truck box is in black epoxy.

That truck is coming together.

 

[JimKueneman]

I watched a video of a guy doing accelerated salt fog testing. POOR-15 was not that great. Epoxy was near the top but Epoxy with base/clear over it actually was what lasted the longest under this test.