Marine tex question

I have a wood stock that I am working on. I am planning to use Marine Tex grey when I bed it, but there are a few other areas of the stock that I would like to add some extra strength to. (It is all going to get painted) I know I could buy some epoxy resin and fiberglass, but I do not want to pay 50 bucks to buy a quart of west systems epoxy. I was just wondering if there is anything I could mix in with the Marine Tex to give it more strength? Maybe chopped up fiberglass? I know this is kind of a weird question. Thanks for the help!

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.