Amish guys paint cars? I didn't even know they drove them (well when no on was looking I bet they took the Firebird for a drive in disqiuse) OK lighten up-no religious prosecution here-I like the Amish!

The one thing I can say with 100% certainty about cars with vinyl roofs is this: the moisture issue is generally a problem AROUND THE REAR WINDOW more than any other place. Of course some people "sand" the paint before they install the top which is not a good plan. Don't do that. CLEAN it with solvent carefully. Water tends to sit in the window frame at the bottom just above the rear decklid.

This is an area that, when you have a VT, you need to be careful about- one thing you can do is after a washing, use an air hose attached to a compressor to lightly blow the water out of that spot and you will be surprised at how much water is sitting in that spot, right underneath the stainless molding that goes around the window.

I can say that after 25 years of owning different cars with vin. tops and restoring them, that this is a place, even in cars that come out of dry climates, that you may find an issue if you aren't careful.

Hope this helps