Epoxy Primer, For internal areas and other questions Options

[bbrock]

I needed to get some epoxy primer for sealing internal parts like the insides of suspension consoles, tunnels, etc. Eventually, I'll be spraying the car with PPG Deltron so the local paint supplier steered me to DP50LF (gray) primer and I picked up a gallon. But this stuff is really expensive (>$300 for paint and activator) so I'm wondering if there is a cheaper option that will provide as good of corrosion protection for internal parts that won't get a top coat other than cavity wax. But I don't want to sacrifice protection, so am happy to use this stuff if it is the best for this purpose. I used Eastwood's rattle can epoxy primer inside my passenger long and it worked well. But once activated, you only have 72 hours to use the whole can. I need something that can be mixed in small amounts for when I only need a little paint.

Also, I bought gray primer because I'll be spraying silver metallic. But I'll be spraying surfacer over the primer. Is there an advantage to exchanging this paint for DP40LF (gray green) to provide a little contrast for when I spray surfacer?

Finally, how much primer should I expect to use for 2 coats on a full bare metal rotisserie job inside and out?