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Thread: paint preparation
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9th November 2012, 07:30 PM #1Senior Member
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paint preparation
I'm looking at repainting parts of my yacht(ts16)There are parts that need filling first.Do i prime,fill,sand THEN paint? or,,,,,,fill,sand prime THEN paint? I ask because i was once told to prime before filling or else the raw wood sucks up the moisture from the filler,and i could fall out.
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10th November 2012, 06:58 AM #2
The usual sequence is seal, fill, cuss, fill some more, sand, invent new, unique cursing techniques, contemplate suicide, prime and paint.
Raw wood is typically sealed with epoxy or other coating during the preliminary fairing phases. Filler, if epoxy or polyester base will not be absorbed on a previously sealed surface. There's no moisture in either product to be sucked out any way, though fillers on raw wood, should be epoxy, just to insure it stays stuck.
Simply put, the raw wood is usually coated with epoxy, then the surface is faired, which means the humps and hollow areas are knocked down or filled. The fairing process can expose raw wood again. No big deal, just seal them up with more epoxy. Once the hull is faired, it gets smoothed, which is a surface treatment, to eliminate sanding marks and other minor imperfections. Lastly, after the surface is faired and smoothed, you're ready for finishing, so the primer and paint go onto a "sweet" surface that isn't going to reflect every imperfection you forget to fill in. The cussing part is the amount of sanding necessary, to make surfaces fair and smooth. It's an ungodly amount if you really want a sweet surface. Personally, I recommend you drink beer during the fairing and smoothing operations, as it tends to lower your tolerance levels enough, for you to not make a career out of it. I just finiahed a boat where the last bit of sanding was done with 2,500 grit. I started with 100 grit and progressed up from there, so you get the picture; my elbows are really off at me. Okay, in my own defense, I used air powered tools for most of it and the customer was a stickler for a real clean finish, which he was paying for. Most folks can live with a 220 grit finish, without issue.
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