While the 847typeM sealer is a great sealer, it is truly tough to work with and dries super quick. I wish they would package the stuff in smaller tubes. The OMC gel seal (or 3M equivalent) is much easier to work with, but requires proper prep or it won’t seal properly. I wouldn’t use just any sealer for this job, it is a super important process that is easily messed up. Imagine firing up a freshly rebuilt powerhead only to see bubbles coming out of the crankcase halves….Now the engine has to be split apart again. Once again, the prep is the real important factor here. If the halves are not properly cleaned/prepped, the block halves will be “shimmed apart” just slightly creating crankcase leaks. It might be a good idea to bolt the crankcase halves together “dry” before assembly and check the various flanges for fit with a small feeler gage.
