Many good sealants to chose from. Stick with a polyurethane, tri-polymer, or poly-ether. I have used many different ones over the years my current favorite is Bostik 1100. Others I would recommend are Sikaflex 505, Trempro 635, and Chemlink M1.
2001 Alpenlite 35RK
2007.5 Chev LMM Duramax/Allison
BD Variable Vane Turbo Brake
TST 507
2010 FLHTC Electra Glide Classic Red Hot Sunglo ๐