I have an 82 GL1100 DD that I had Red-Koted.
Read up starting here:
http://www.randakksblog.com/fuel-tank-radiator-repair/I had Bill do mine when it was still under resurrection and I was visiting the homeland. Worth stopping in if you get nearby, especially if you admire Studebakers and enjoy "shops" of all sorts. Bill will receive and ship back, for a fee, in YOUR packaging.
No experience with the Kreem, sorry.
My Red-Kote has been flawless, based on performance and busted open filters.
Bill does a great job (but your cage will smell all the way home).
YMMV.