When I built my -7 I sprayed the cowling with a recommended two part filler/primer (gray color in can with a hardener, can't remember the name) to fill pinholes and protect the surface until I painted the plane. A year later the filler is now cracking off in places and does not appear to have either a) adhered well to the underlying fiberglass/resin (I did coat the cowling with raw thinned resin per Vans instructions) or b) filled the underlying pin holes.
I think I sprayed at too cold a temperature and too thick.
Is there a reasonable way to remove the filler other than sanding back to the fiberglass (I have sanded back one part of the cowl and it took ages ) and is the pin hole filling recommendation these days to squeegee raw resin (versus thinned raw resin).
Also can I prime without making a choice of the type of paint I will eventually use or do they have to match up.
I think I sprayed at too cold a temperature and too thick.
Is there a reasonable way to remove the filler other than sanding back to the fiberglass (I have sanded back one part of the cowl and it took ages ) and is the pin hole filling recommendation these days to squeegee raw resin (versus thinned raw resin).
Also can I prime without making a choice of the type of paint I will eventually use or do they have to match up.