On Tuesday, October 16, 2018 at 1:19:04 PM UTC-7, wrote:
Primer is rolled on to force it into the million pinholes left after sanding. If the first coats are sprayed many pinholes are bridged and show up again after the first sanding. How smooth it is doesn't matter too much..
UH

Thanks for telling me what does not matter to me. I had no idea!

I assisted UH in refinishing my ASW 24 wings last winter. I, too, was a little concerned with rolling anything on the wings we had so carefully templated before we started. Surely spraying was necessary to get the accurate profile we were after.

He's right; the rolling imperfections sanded out relatively quickly. I'm not sure how many more pinholes would have shown up if he hadn't been so diligent about forcing the primer-filler into the structure. But the relatively few that remained were a pain to touch up individually, especially as we kept finding more at each subsequent stage. The finished wings justified his approach and after three long contests this year, I couldn't be happier with the performance.

Chip Bearden

More progress, sanding next step spray 1 coat of vinyl ester surfacer.


http://www.craggyaero.com/ventus.htm

Richard
www.craggyaero.com