[firecat1981]

Not really sure what you're trying to show in the pictures, but what kind of sander are you using? 1/4 sheet? random orbit? air powered orbital?

What grit paper are you using? Start with a rough grit like 60 but stop sanding with the 60 when you get through the paint most of the way, then step it up to a smoother grit like 100. I perfer to sand with 150 grit before priming and 220-320 between coats of paint. Aways keep the sander moving so it doesn't dig in to bad. Small circles or a zig-zag pattern work well for me depending on what I'm sanding.

 

[firecat1981]

The 5" orbital is a random orbital, the little triangle deal is just a finish sander. The 60 will get the job done quickly, but be careful, all you are trying to do is get the paint off, you don't want to dig to much into the fiberglass. It's a pain, but keep at it.

 

[firecat1981]

Nothing wrong with 80 grit. Being he was already sanding with 200 and in an hour he only was able to finish 1 square foot how would 180 really help him? I also doubt it was just spray paint by that description, maybe floor paint.

 

[firecat1981]

If you use the interlux perfection you can "roll and tip" it pretty easily with good results. Look up roll and tip on youtube, jamestowndistributors should have a few videos on it.
I'm not sure about awlgrip.