Instead of punching a bunch of holes in sticky tape (I couldn't punch out consistently round holes!), I just used some lengths of old electrician's tape (long runs crossed by short stub pieces) to "frame" each of the rivets. A little dab o' ProSeal on each rivet head, smoothed out with a wet fingertip, let it set a bit, and tear off the tape. VIOLA -- a series of neat, squarish, well-sealed rivet heads. Tape is your friend when working with the gooey stuff.

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David Heal - Windsor, CA (near Santa Rosa)
EAA #23982 (circa 1965) - EAA Technical Counselor and Flight Advisor; CFI - A&I
RV-12 E-LSA #120496 (SV w/ AP and ADS-B 2020) - N124DH flying since March 2014 - 940+ hours (as of September 2020)!

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AF donation through June 2021.