Re: Horrible Paint job, and how to proceed?
It sounds like you need to strip it and start fresh. 3 paint jobs is too much and trying to sand through one or two layers is a big gamble. Original paint is not a good foundation as old enamel and lacquer can't hold up to the solvents used in modern paint.
There are a few options for stripping a vehicle: sandblasting, sanding, and chemicals. You can use a heat gun and a razor blade to take off as much as you can and then you can either use a tool like the Eastwood SCT or take it to a sandblaster. Sandblasting is the best prep but adds up and don't let an inexperienced blaster work on big flat panels because they can be warped.
Whichever route you choose, you can't go wrong with bare steel followed by epoxy primer, 2K primer, sealer, then base/clear or single stage. I would recommend as much SPI products as possible.
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