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Old 07-11-2006, 09:25 PM
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How do you paint fiberglass correctly? I painted and have problems

Hi,

I painted my fiberglass pieces with the same primer and sealer I used for the car body (metal)

After being in the hot garage for a week I see the paint/clear bubbling and peeling off the fiberglass. Was I suppose to use a different type of primer or sealer? What grit was I suppose to sand the fiberglass with before primer? I sanded it with 180 grit. Maybe that was too smooth? Please help. Thanks

I used PCL PolyPrimer and Epoxy sealer

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Old 07-11-2006, 09:41 PM
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Is the primer peeling off the fiberglass or is the paint peeling off your primer?

If the peeling is down to the glass you can bet there was still mold release agent on the parts before you primed or outgassing of solvent if they were really fresh out of the molds.

Using the same products on fiberglass is fine but special care must be taken to make sure the glass is cleaned and prepped before any primer goes on, sanding with 180 is fine but if the part wasn't cleaned first you could have sanded the mold release into the surface of the part making it tough to clean.
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Old 07-11-2006, 10:00 PM
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That is very likely to be the case. What should I have cleaned it with? I used dish soap and then cleaned it with wax and grease remover for cleaning surfaces before painting. I got it at the autopaint shop. Maybe I should of scrubbed harder. I did sand it before washing it so I must of pushed it further into the material... after I sand it back down to the glass..should I skip primer and go straight with the epoxy sealer? Or use some epoxy primer that I have. Thanks
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Old 07-11-2006, 10:45 PM
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Quote:
Originally Posted by baddbob
Using the same products on fiberglass is fine but special care must be taken to make sure the glass is cleaned and prepped before any primer goes on, sanding with 180 is fine but if the part wasn't cleaned first you could have sanded the mold release into the surface of the part making it tough to clean.
Myself I use 80 grit for that..and scrub the part first with dawn dishwashing detergent and a scuff pad about until my arms about fall off..Setting out in the sun and letting the parts cure out well is good also..Gotta get some tooth to the surface before painting glass in my experience..Yes use the epoxy primer direct to the glass then carry on from there..

Sam
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Last edited by OneMoreTime; 07-11-2006 at 10:47 PM. Reason: more stuff
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