Don't believe I would add anything. Marine Tex can be machined after curing.
Basically, most of the two part epoxy's are excellent.
When I worked in the machine show, air cooled engines with scored cylinders were easily salvaged by glass beading the scored cylinder wall to remove any deposits, mix up some JB Weld, apply, let dry completely, scrape with special knives that were contoured to the specific bore size of the cylinder, then bore the cylinder....and this would last quite a while.....believe it or not.
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