Whenever i glass something i always add another coat of resin ontop of the already hard fiberglass so when i sand the bondo i dont sand into the glass. When it happens its a pain to get the glass to not show throw the paint or hide it with bondo or something. i was just wondering what you guys do when and if you do it.
if you sand through to the glass you should glass back over it and not sand as much this time.
?!?!?!? well if you're paining it why would it matter if fiberglass is on top. You prep and prime the fiberglass surface just as you would if you are painting wood/plastics as well.
Filler is used as a filler for high and low spots....you are gonig to have patches of fiberglass, filler and even re-inforced fiberglass filler showing in different areas.
I wouldn't suggest coating the already hardened surface with another coat of just resin. Resin is brittle, the fiberglass cloth/mat is what gives fiberglass the strength.
sanding fiberglass isn't a bad thing either...don't be afraid to sand into what you have glassed. If you added enough layers you wouldn't have to worry about it to begin with.
I'd hate to tell you this, but fiberglass itself is way too pourous to paint over...
Ever notice on like... All fiberglass kits either have a gel coat or some other coat of something over it to get it smooth??? Applying just another coat of resin is not a good idea at all. To help smooth out the fiberglass and get rid of the "pourous" matter it is... apply a light coat of glazing putty to smooth it out... or if you have larger bubbles in the fiberglass some body filler or short hair fiberglass.
It's not really even recommended to use just a high build primer over "smooth" fiberglaass.... again fiberglass is just too pourous to paint over.
sorry i wasn't so clear but what i ment is the sometimes when im sandin whatever it is i made with fiberglass i sand throw the resin into the fiberglass cloth and the cloth shows and when i prime the surface if i dont notice it the weave shows.
Ryan Shissler wrote:sorry i wasn't so clear but what i ment is the sometimes when im sandin whatever it is i made with fiberglass i sand throw the resin into the fiberglass cloth and the cloth shows and when i prime the surface if i dont notice it the weave shows.
Did you not read what I said about how you shouldn't prime/paint over fiberglass itself??? It needs either some sort of gel coat or glazing putty OVER IT BEFORE PRIMING
at least that's the proper way to do it... if you want to half arse it go ahead
Not trying to be a biotch... but READ PLEASE
You want to do all of your bodywork to the fiberglass and then seal it with a couple coats of polyester primer sealer. This is just like a gel coat. then you can sand it with 180 grit paper and try not to burn through. Add a couple coats of 2k urethane primer to do your blocking with 220. Prime again with 2K and wet sand with 400 and it is ready for paint. Be patient and let each stage of primer dry good for about a week before you sand. This will ensure that it is fully cured and you should have minimal shrinking.
