I’ve never used them but Threebond products have been around for a good while and they are commonly used for sealing crankcase halves. They would work as an outboard crankcase sealer but if it’s a straight metal joint with no spaghetti seal, then I typically use Permatex anaerobic gasket sealer on my OMC motors. It works great and is a lot easier to use than the sticky, gooey, messy 3M847. The 847 can be used on crankcase halves that use a spaghetti seal but not a straight metal to metal joint. I also used Permatex Moto-Seal to seal the crankcase halves on an Evinrude motor – it’s very similar to the Threebond products.
For sealing OMC gear cases, I recommend Permatex Ultra Black. It’s WAY easier to use than 847 and seals just as well.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp
“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
