Originally posted by Grim
When painting fiberglass what is the best method. I have never worked with fiberglass but was wondering if the best thing to do is lay a thin coat of bondo, sand, a few coats of primer, hand sand between each coat, and 8 to 10 coats, of paint, again hand sand between each caot, then a few coats of clear, wait a few days to a week, then polish???
This is what I have gathered from the few resources.
Well it kind of depends on whether you have raw glass showing or not .
You dont want to just spread a coat of bondo over raw glass , as it will eventually soak and you will see it after a few months after painting .
What needs to be done is buy some fiber glass resin and mix ( real slow to keep out air bubbles)and mix just enough for the area then brush on real slow ( to keep from air bubbles) ,want enough on so when dry you dont sand through it and have to do it again.
Then all you need to do , is finish it off like you would a metal panel.

The correct amount of paint on a car is 9 Mills , thats around 3-4 coats of sanded primer , a coat of sealer , 3-4 coats of base, and 2 coats of clear( 2 more coats can be sprayed for later of the sanding and buffing . this way you have the required amount of clear covering the base for UV protection !!!!!
And its a NO NO on sanding a modern base coat, ( unless you hung a run in it , but it will need a few coats to get an even lay out of color.
Dont buy into the hype of all this sanding inbetween coats and then all the sanding of clear. Most of that was brought on by backyard do it your selfers that didnt do it for a living .
First choose a paint product ( PPG, Dupont, S-W, Sikkens.....ect) and use all the recomended products to go from start to finish.
If you follow directions you should have a very nice job when done .
SprayTech