Looking for some advise on what materials to use for replacing my transom. It is rotten half way down. Is the marine grade plywood from hd/lowes good enough? Want to make sure it is strong enough to handle the power I will be putting in it 600+hp. Is this a good repair kit for Fiberglas https://www.amazon.com/gp/aw/d/B01JZYI2EW/ref=mp_s_a_1_2?ie=UTF8&qid=1492610425&sr=8-2&pi=AC_SX236_SY340_QL65&keywords=transom+repair+k it&dpPl=1&dpID=510MJIM2WTL&ref=plSrch

The Marine plywood is just fine as long as it is totally encapsulated. You really do not need an epoxy although takes away the need for a respirator/mask.