Using plastic plywood in boat refinish

Curious who has any experience and the pros/cons of using plastic plywood in a boat rebuild?

I’m re-doing a 1990ish Lund 1600 Angler and looking at this:

http://www.american-plasticlumber.com/lumber/sheetgoods/

I’ve use expanded pvc sheets in wet areas and they work good. Treat it just like plywood, but I have gotten mold on it. Not sure if the recycled plastic is the same type of product though.

How stiff is it? In floor applications, is 3/4” as stiff as 3/4 marine ply? Trying to gauge how much it moves, expands, or contract compared to wood

Randy Wieland wrote:

Trying to gauge how much it moves, expands, or contract compared to wood

The specs for the plastic call for;
Coefficient of Expansion E831 TMA in/in/°F (10 -5) 6.7

You would need to look up the specs for the wood product you are considering.

Thermo-Lite board is the standard for the marine industry. Are you re-doing a floor, transom, stringer? It’s not necessarily cheap, but it won’t rot, has excellent thermal properties and you can choose what densities fit your needs.

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Man I’ve considered this often. Either that or just straight up aluminum, if the day ever comes when I have to re-do floors. Although my first thought is Lund’s Lifetime Deck Guarantee as long as your the original owner… but I’m not confident they would ever make good on it.