71 2+2 in need of paint- have a bit of a 2 tone going on due to somebody's earlier attempt at color match- how to know whether to strip to metal or sand down thoroughly with 600 and shoot over what's there???- ppg base/clear to come- assuming part of existing paint is orig- are there compatability issues? thanks

 

If you don't know the paint or what's underneath it then it's best to strip to a base that you know is solid. Prime with good quality epoxy primer to seal old paint after thoroughly cleaning.

 

The gentleman is right about getting to a uniform base and epoxy coating. This is a quick way to get to a good surface. For an inexpensive paint job this would be proper. But there will always be that small %age of not knowing what you left under that underlying coat There could be some rust or some lifting later. I'ts the insecurity of the process that's the concern. It may last forever but, because of the variable left (under) the paint, you'll never be sure. If you're willing to take the chance with all that money and labor costs than do, as many a car has been just fine this way,but if you're thinking of investing in an expensive paint job, then removal of ALL the paint is a must and supplies insurance that it will stay on for a long long time Hope this helped BudP.S. Don't forget you'll need a primer surfacer on top of the epoxy to get it ready for the topcoats.

 

I have a 1970 Jag convertible that I am stripping down to bare metal and repainting in my garage using PPG products. If I can help you with any advice or answer any questions you may have please contact direct at jjurkiewicz@wowway.com
I am an amateur painter but from what I've learned, if you don't use the correct procedures and the right products, you can easily have paint failure rather quickly.