I slightly bent the flange to approximate the curvature of the skin. I placed a piece of Saran Wrap (or equivalent release agent) on the inside of the skin at the flange/skin interface. Then I loosely installed the flange using a good bead of seml-flexible/fuel-tolerant sealant on the flange face. Don't fully tighten the screws until the sealant has cured and the Saran Wrap has been removed. This has worked well for me. Whatever you do, do not permanently adhere the flange to the skin -- one day you may have to separate the two.
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 Feb 2014 - 1,290+ hours (as of May 2023)!
through June 2023.
Last edited by DHeal : 05-19-2023 at 02:28 PM.