Originally Posted by El Campo
Am in the process of repainting the frame on my truck and was wondering about what paint to use. I am sandblasting it (frame is boxed and have some experience with sandblasting so am not worried about warping it) and then plan on using SPI epoxy primer on it. If I understand SPI website correctly for the most corrosion protection Barry says to use 3 coats of primer instead of the usual 2. Living in South Texas this is a big concern for me as things rust inside my insulated concrete floored shop even as the humidity is more often 100% than below. After that I was wondering about what paint to use. I plan on painting the engine, control arms and trailing arms hugger orange so will be using Chromabase on these parts (as I understand that orange does not cover well and fades more easily in Nason and these parts are easily seen from the outside of truck). For the frame itself though I was wondering about using the Nason Fulbase Urethane BC/CC in Jet Black. It is about 100 bucks versus 270 (for the Chromabase) for a gallon. Will this be good enough for a frame or will it peel, rust through etc? This is going to be a very nice driver (hopefully) and some local car shows but not a trailer queen. O yes and then I will be clearing it with SPI clear also. Any help or recommendations about anything would be greatly appreciated!!! Am not interested in painting with any rust convertor or POR 15 incidentally, have had poor luck with those.
I think most any of the epoxy's or urethane's will work very well. The or A big problem in high humidity environments is rust from the inside. A frame has a lot of tooling and access holes that let water and humidity in. For full protection things have to painted inside as well.
You can by the equipment http://www.chemicar.com/tools_spraygun_under.php
but its pricey for a one or two time use. What I do is to use a paint pot from Harbor Freight and make a spray tip from copper tube that fits to a length of paint hose. Then put it into the frame all the way to the opposite end. Run up pressure in the pot regulate the output with a valve (pre tested for pattern and amount) then pull the hose back out of the frame or rocker panel or other places you just can't get into with a spray gun.
It's messy to be sure but nobody's gonna look inside the frame but you and then probably only once. First time I did this was 50 years ago with real Rustoleum, Damp Red Primer to my 61 Ford Starliner coupe when I was stationed in Guam. Had a crushed coral driveway, the paint drained out of the frame and rocker panels for days, it looked like the most gruesome murder in history happened in that driveway. No more rust problems, however.