I have had very good success (i.e., easy-to-use, cheap, available, no leaks, etc.) with Loctite's 567 sealant for all of my RV-12's fuel, oil, and hydraulic fittings. 567 is also compatible with fuels containing ethanol -- if that is a factor in your case. I have heard that some of the traditional aviation sealants don't tolerate ethanol very well.
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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)! 
V AF donation through June 2021.
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