Edit: Have you done any research for waterproofing plywood?
Personally, West Epoxy would not be my choice just because of the price.
There are many other methods discussed here in depth to treat the
decks of boats......... but, it is your call.
I have used literally gallons and gallons of the 105/106 for fabricating
wood sign blanks for its adhesion properties - but never for waterproofing.
do you have a 105 kit on hand now ?
I am thinking of a math situation . . . . .
mix one ounce of the properly proportioned products:
using a Bondo plastic spreader, old credit card, etc,
smear the prepared mix on a piece of scrap plywood
similar in grain and finish that you want to protect and
see how much surface area that one ounce will cover.
Then, do the math of your plywood in square inches and
that should give you a ball park figure of how much you
will need for the first coat. Then, do the same method
for the second after the first has cured ..........
sort of like paint = 400 square feet per gallon,
100 square feet per quart, yada yada yada.
the amount to cover anything will depend on the porousity
of the material you are going to cover. and of course, the
second coat will cover much more than the first.
- OR - simply call the Customer Service phone number and
ask for technical support in epoxy. (800) 262-8464