Join Date: Jun 2006
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1) I suggest marine plywood, as there are fewer voids, more glue and it is generally more resistant to rot, particularly out in the weather.
2) You have two courses of action: a) Match by eye or photo the existing teak stain to the stain you want for the plywood, or b) sand down the teak and stain both with the same product.
As far as I know, there are several colours of Cetol now. You don't have to settle for that orangey stuff, which never bothered me, but bugs some people.