Thank you very much for the invaluable information. Just wondering what males that formula better than if I was to just use multiple coats of spar varnish on its own? Appreciate it
Saturation and penetration
If you are lile me, you will die before you have to replace the treated wood....or be in a different boat.
What did you do to the treated wood in order for it to be kept for so long without any rot?
plywood IS a composite.
to clarify, he is not using pressure treated.
so my plan is to use the old timers formula with epifans clear spar varnish on marine grade plywood. is there anything that I should change or add to this plan, thanks appreciate the replies
Marine plywood should be fine on its own for a very long time.Penetrating Waterproofing can help HOWEVER if you are coating the wood with something like varnish ,I think you are inviting trouble.Anywhere you have to make a hole like for a screw or bolt,you will potentially have a spot for moisture to intrude on the wood and the moisture will be locked it by the varnish thus promoting rot.I dont like the varnish idea.Just my 2 cents...Charlie
yes it should be said oversize drill holes and fill with epoxy then redrill so the holes are sealed thats the way i did mine and i know i will never have a problem anything screwed to my wood gets oversized hole and epoxy then gets redrilled for proper screw size so it don't expand it and crack it.
I thought that the whole point of spar varnish was to be water resistant and not fully waterproof as to allow the wood to breathe? That's my understanding as to why people use spar varnish over an epoxy coating
On my 1974 12’ StarCraft, I used marine plywood, sealed with marine resin and then marine paint - should last another 48 years! Lol BTW, using a jack plate makes for a great ride and freed up transom space to mount my sport ladder and boat hook!
How are you fastening ply to transom? A BUNCH of 1/4" x 20s????? I have had some success on regular ply using polyester (no wax) thinned 400% with acetone. The wood sucks up the mix. But wood was NOT transom. If it were me, I used pressure treated and let it totally dry and then prim and paint and best way to fasten to boat. Rot usually occurs at drain hole.
coat metal side with epoxy.
