Shearwater
Well-Known Member
Plywood rudder blade needs a bit of repair and filling a few gouges. Do I then paint (undercoat + top coat) then key the surface and antifoul or omit the painting and apply antifoul on to the 'as is' surface?
plywood rudder: OK to paint to seal & then antifoul ???
- Thread starter Shearwater
- Start date
pampas
Well-Known Member
If your ply is dry I would apply one coat of epoxy resin then a couple of coats of antifouling, Well thats what I did 4 years ago and the rudder weighs the same approx. as new, so no ingress of water. I dare say somebody will say this method requires priming etc but have found from years of antifouling if some gets where you do not need it, it sticks like hell.
simonfraser
Well-Known Member
def epoxy it
oldsaltoz
Well-Known Member
Most Important:
Make sure the timber is very dry before you coat it with an epoxy, any remaining moisture will be sealed in and may cause problems later.
Sand back to bare timber, Mix a small (Half a cup) of epoxy resin and hardener and add 30% by volume or weight of Methylated Spirits, this will thin the epoxy and improve penetration.
Add several coats to exposed end grain as it will suck up a lot more than other areas.
Leave it to cure, then wash it with a running hose starting at the top working down and around, use a plastic pot scourer (scotch brite) and rub till the water no longer forms beads, this removes the residue left by the curing process. If you sand without washing you will only spread the contamination.
Now add 4 coats of normal mix resin, use small batches and on tacky to avoid sanding between coats.
After curing another wash as above before sanding.
I always apply a coat of high build epoxy, this ensures whatever yo coat it will stick in the long term as well as providing some extra protection when stripping off old coatings later.
Hope this helps.
Avagoodweekend......
Make sure the timber is very dry before you coat it with an epoxy, any remaining moisture will be sealed in and may cause problems later.
Sand back to bare timber, Mix a small (Half a cup) of epoxy resin and hardener and add 30% by volume or weight of Methylated Spirits, this will thin the epoxy and improve penetration.
Add several coats to exposed end grain as it will suck up a lot more than other areas.
Leave it to cure, then wash it with a running hose starting at the top working down and around, use a plastic pot scourer (scotch brite) and rub till the water no longer forms beads, this removes the residue left by the curing process. If you sand without washing you will only spread the contamination.
Now add 4 coats of normal mix resin, use small batches and on tacky to avoid sanding between coats.
After curing another wash as above before sanding.
I always apply a coat of high build epoxy, this ensures whatever yo coat it will stick in the long term as well as providing some extra protection when stripping off old coatings later.
Hope this helps.
Avagoodweekend......