I've used West Systems for many years and early last year decided to give the MAS a try.........won't do that again. I was really surprised how easily the MAS epoxy discolored on a couple boat engine wells when it got exposed to fuel. Granted we a talking high nitro content fuel but like Mikey said, why risk it. While it might work well for others I personally did not like it, which was disappointing as I do like the mix ratio they use and that the containers are clear so you can see how much you have left. I also tried to do a repair over West Systems with MAS and it did not hold up, wound up re-doing it with West. For me the West Systems is still hands down the best I've used and you should be able to purchase it locally at any decent marine supply store. Go to
http://www.westsystem.com and click on "where to buy" and type in your zip code to find a local dealer. B)