Related to higher temp epoxy but unrelated to your problem. Have a Kawasaki FD731V that developed a slight coolant leak at the bottom of the case where there was evidence of a scarcity of case sealant. Little chunks of the sealant had come out. Cleaned everything up, laid down a thin smear of higher temp two part, making sure that the crack was filled with it, then let it cure for 24 hours. Then scuffed up the epoxy to give it some "tooth" and cleaned again. Cut out a patch of stainless woven wire larger than the original application that would provide a 50% wire to hole ratio as a matrix and covered that with another coating of epoxy that entirely encapsulated the wire, allowing to cure for another 24 hours. This is a fairly low temp area rarely seeing more than 170F but was under the exhaust pipe which was wrapped in header blanket to keep the temp low on the matrix from radiational transfer. 180 hours later zero issues, no more leak.
