Topcoat for fiberglass work

[nohoflyer]

This is what I’ve been able to accomplish. But the finish feels delicate with the micro topcoat. Is there a paint finish that will bond this and protect it? Or do I leave it for final paint someday?

 

[rsr3]

I did mine with a combination of micro and then polyester filler but have left it at a stage where you are for paint. As yet, unpainted.

 

[DanH]

https://vansairforce.net/community/showthread.php?t=22931&page=2

Posts 15 and 17

 

[lr172]

pourous material like micro or poly fillers will absorb contaminants from the atmospere including that brought with rain and create paint bonding problems. A good painter will be forced to sand them down some before paint. Better to put a light coat of something over it, so he sands that off instead of your filler. NEVER apply paint over pourous material that has been outside for more than a day or two.

 

[PaulvS]

The filler needs to be sealed first by brushing on a coat of epoxy resin and then squeegee it into the pores as per DanH link. If this step is missed then any paint will have pinholes.
I then applied epoxy primer after sanding the resin coat and this protects the surface until it is time for final painting.

 

[nohoflyer]

Epoxy primer ordered! Thanks gents.