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Message: <blockquote data-quote="thill" data-source="post: 512454" data-attributes="member: 4972">5200 on engine bolt holes?   Ouch.   I've had to remove engines that had 4200 or 5200, and the bond is so tenacious that it sometimes pulls the skin of the boat off with the engine.Personally, I use 3M marine silicone applied inside, outside and on the bolt itself.    You want enough that the entire area is thoroughly filled in, but not so much that it's blobbing all down the back of the boat.A trick I've used at times is to tighten up the bolts "most of the way" but not fully torqued down.   Then come back in a couple of days and torque it fully.   Supposedly, this allows the silicone to firm up, and then when you torque it fully, it acts as a gasket.   Supposedly, this is good for aluminum boats to isolate parts.But generally, I coat everything, torque it down, wipe excess as needed and call it a day.  No issues either way, but I strongly recommend that you use something.  If not, your transom is going to take on some water and possibly even leak into the boat itself.</blockquote>