Go to Southern Polyurethanes website and read "The Perfect Paintjob". Also, their tech book is a great read. Their products are not outrageously expensive and of (IMO) great quality. The owner of the business will answer your phone calls, lists his personal phone on the tech book. The forum they have is great for learning as well.
Here's a rundown of how I do it.
1. Strip to bare metal (no paint removal products, just a razor blade and 80 grit).
2. Coat in epoxy ("seals" the metal so you have a good foundation)
3. Beat out dents, replace panels, etc etc
4. Re-epoxy over filler and paint that was removed for panel replacement
5. Spray 2k or poly primer for some build.
6. Block sand until laser straight.
7. Seal with reduced epoxy.
8. Base
9. Clear
You can go way more in depth, but that's a simple rundown. As you can see, I use epoxy often as it is a great barrier to prevent water from getting to metal and solvents from escaping into your base or clear. It also seals porous body fillers pretty well, or even wood for home projects.
I'm not a salesman of SPI, just happy with their products and the people on their forum have helped me a ton. Learned a lot about not only what to do, but why. Why paint will wrinkle, bubble, wave, etc etc... couple grumps on the forum, but it's pretty good.
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