Epoxy Over Acrylic Enamel

B

Brad4321

I have a small truckload of fresh Cummins engine rebuilds to paint. The engines are clean, but around 50% of the original paint is still intact. The engines were all originally painted with PPG Delstar and hardener was used. Primer was not used in subsequent painting/touchups, so there is likely small patches of paint on the engine directly on bare metal.

The paint is overall in decent condition, other than being old and faded. I am suppose to paint these engines in two different colors: black and cummins red. I was planning on shooting straight black epoxy for the black with no topcoat, and top coating with a red SS urethane for the red engines.

Will I have any issues down the road shooting the epoxy over the original paint on the engines? The possible lack of primer does worry me. If I should strip it all off, any advice on how to do so? I don't like the idea of blasting assembled engines.
 
Clean as best you can and spray them, the epoxy will go over anything that is there, adhesion will be as good as your cleaning and probably better than anything else you could apply, and the epoxy is very durable and chemical resistant.
 
I use SPI epoxy on all of my refinishes, but I have never painted an engine with it before. My concern was lifting down the road due to the (possibly) poor adhesion the AE will have to bare metal. I don't doubt the durability or chemical resistance of the epoxy, hence my reason for wanting to use it. Speaking of which, what is the max sustainable temperature the epoxy can withstand?
 
usually all the paint will fly off when you pressure wash one. whats left is adhered well . good luck with it.

oh , and epoxy will stick to air if it will be still for a second......
 
I've found that the nice thing about black epoxy is that if the engine happens to have a hot spot (like around the exhaust ports) you can touch these areas up with some barbeque paint in a mini gun and it doesn't look half bad.

Oh, and what shine said, if a steaming hot pressure wash won't remove the finish, I think you are safe to leave it.
 
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