Have heard great things about Diamondite, but personally I use Flexcoat Lite over Chromaseal thread preserver. Pretty happy with the results.
Regards, Gra
"Political Correctness is a doctrine fostered by a delusional, illogical liberal minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."