Underneath the old paint

Hey all, so I have been taking off the old paint from my mirror (Cabbage) and have found the underneath to be somewhat of a patchwork! I have included pictures in an album to show better what I mean, and have added descriptions in the info section of each picture, which can be reached by clicking the "i" in the circle in the top right when you are looking at the pictures one at a time:


My theory is that in some places they have primed with an epoxy filler and then a dark undercoat (region 1), in others they've painted the top coat straight onto the wood (region 2), in yet others again they've used a traditional metallic primer (region 3) and in some places theyve got some kind of weird resin (maybe polyester?) as the primer.

I'd like firstly to know what people think as to the identity of each substance and if there are any ways to check for sure, and secondly what people think is the best course of action. I have bought Dulux trade weathershield and the man in the shop said he reckoned that the primer needs to be on bare wood to be worth using, so my original plan was to remove any and all previous coatings. However I have since realised that the places where I've patched holes and filleted under the gunwhales are epoxy rather than bare wood, not to mention all of the tape! So now I'm not sure if it's worth committing to the three part system on some of the boat if the tapes, patches and corners (the parts that I would guess need the best waterproofing) will only have the undercoat and topcoat.

Thanks very much!

PuffinInTegel's picture

Looking at this picture, bottom left-hand corner, I see a piece of fibreglass fabric. I've never had a boat in this condition, but would recommend removing it if it is a larger patch (and not just a piece of the taping). If the wood underneath is rotten, you'll have to patch it properly.
old paint
Where the wood is sound and the undercoat/primer adheres properly, there's no need to go down to bare wood. Sand everthing smooth and then build up a proper finish with recommended primer/undercoat/finish.
Of course loose tape will have to be replaced.
Here's wishing you much success and fun with the boat when you're finished!
Gernot H.

curlew's picture

I would look for any faulty wood. As you know, it can be patched with wood/epoxy/fibre glassed quite easily. I use blue antifreeze to kill the rot - soak suspect wood for a couple of days but don't let cats near it as it is a bit poisonous.
When everything is a hotchpotch like that, I have used Dulux Multi Surface Primer. It goes on to all things! No need to rub down to wood where you have a sound surface. Be ruthless searching for rot - repair is easy.
Good sailing.