[crabandy]

I figured the inside of the cowling would be a good test bed for trying drywall mud as a pinhole filler, I figure the extra heat should help expose anything and if it does the areas will be under the cowling. The inside of the cowling was coated with raw epoxy but never properly block sanded, I added a thin coat of filler and sanded smooth. I then spread drywall mud on with a rubber scraper, I added a second coat later just smooshing it around the surface with my hands. As expected it sanded of very easily, it seemed to fill the little scratches, small and large pinholes well.






I carefully cleaned it up and squeegeed on a coat of epoxy primer. I wet/block sanded this and then sprayed a coat of epoxy primer that I also wet sanded.