steve cowan wrote:There is a sticky topic in the "foamie" section called [waterproofing your wood] that goes into a lot of detail about this.I would think after saturating the plywood with the "mix" that a good oil base enamel would last a long time.
KCStudly wrote:My mother has been a long time subscriber to Consumer Reports. When they were having to redo their deck for the second or third time, Consumer Reports did a test/review of deck sealers, and the most well known brand that everyone trusts, yes Thompson's, scored the worst.
Not my personal experience. I've never used their products, but this memory has always stuck with me. Just saying. (The obvious question is, which brand scored the highest? Sorry, that piece of info wasn't what stood out for me, so I don't recall.)
But what I have learned is just because a company spends a lot of money on advertising and have flooded the market, doesn't mean that they have the best product. (DR mowers are another example, their ads are everywhere and their products are usually under engineered, IMO.)
For painted plywood many have been disappointed when after a short period the paint splits (actually, the wood splits under the paint) and the deterioration begins. Granted this is most common on bent wood that is under stress. The problem is that the wood fibers are only strong in the long direction, and don't hold together side by side that well. The solution is to reinforce the fibers across the grain using other fivers; such as cotton canvas saturated in glue and paint, or fiberglass cloth saturated in epoxy (or perhaps polyester if you aren't going to be working near any foam insulation... polyester resin eats foam).
Then paint.
Other opinions may vary, plenty people have gotten useful service lives out of plain painted plywood, but weather conditions vary across the land, so take that into consideration, too.
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