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redback View Drop Down
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    Posted: 28 Apr 07 at 10:45pm
If you are going to paint or spray don't sand with such fine wet&dry the paint won't key so well and will rub off in the case.  I'd use something like to 240.  There's no need to spray by the way, a brush will do and then rub down with 240, 360, 400 and 600.  There's no point in going any finer if you don't mind a silky sheen and its supposed to be faster than polished.
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Paramedic View Drop Down
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Posts: 929 		Post Options Post Options   Quote Paramedic Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 07 at 6:17pm

Gelcoat is great at what it's intended to do - coat.

People run into problems, or rather repairs that don't last, when they try to build up large missing chunks with gelcoat. It's not structural.

However there is not really anything better to use to coat repairs especially to foils. Paint is too soft and tends to rub off on the inside of the boat leaving it a right mess, particularly with fixed rudders and daggerboards. I'd recommend damage to a gelcoated foil is always gelled not painted. As long as the repair is smooth, fair and polished it doesn't really matter what it looks like.
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mike ellis View Drop Down
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Posts: 2339 		Post Options Post Options   Quote mike ellis Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 07 at 6:38pm
Originally posted by Paramedic

What's the problem with gelcoat?

no idea im just repeating what ive heard.
600 732, will call it Sticks and Stones when i get round to it.
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Adam.s View Drop Down
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Posts: 122 		Post Options Post Options   Quote Adam.s Quote  Post ReplyReply Direct Link To This Post Posted: 26 Apr 07 at 11:21am
Yeah i had a few other scratchs/grooves that i wanted to fix so i filled them to, so the board would look a bit patchy if i didn't spray it. im going to wet and dry the foil before spraying with like 1200 or 1500 then when i spray a coat do i have to wet and dry or wait until i've done all the painting. And how many coats should i give it?
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Paramedic View Drop Down
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Posts: 929 		Post Options Post Options   Quote Paramedic Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 07 at 11:42pm

What's the problem with gelcoat? If it's for coating purposes that's exactly what the board is coated with from new.

Now that you've got the tip glued on, get some dawn grey gelcoat, sand the glueline so that there is a feelable dip, apply gelcoat wet & dry flat and the repair will be invisible. There is not really any need to paint.

If your fussy you can probably put your marine filler (Adequate but perhaps untidy) right with this method.



Edited by Paramedic
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Adam.s View Drop Down
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Posts: 122 		Post Options Post Options   Quote Adam.s Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 07 at 9:23pm

ok thanks hopefully the filler will last
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mike ellis View Drop Down
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Posts: 2339 		Post Options Post Options   Quote mike ellis Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 07 at 9:09pm

ask time intheboat, heres what he said on another thread (dinghy development, page 2, gelcoat repair):

 

I've just spent some quality time with my boat and here's some top tips of things I wish had done.

-   tape up outside the area being repaired
-  don't put too much on - it's a wotsit to sand off. better to build up.
-  try to get it as true as poss before you sand
-  if it goes in awkward places (centerboard case) work out first how you are going to sand it down.
-  get a white boat

Things I got right - eventually
- use epoxy not gelcoat for chips on the trailing edge of the board
- 400 is the lowest starting point 1200 is good to get that final smooth point
- lots of water with W&D - always use a block



Edited by mike ellis
600 732, will call it Sticks and Stones when i get round to it.
Also International 14, 1318
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Adam.s View Drop Down
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Posts: 122 		Post Options Post Options   Quote Adam.s Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 07 at 8:27pm

oo to late but in the end i used marine filler is that any good?
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mike ellis View Drop Down
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Posts: 2339 		Post Options Post Options   Quote mike ellis Quote  Post ReplyReply Direct Link To This Post Posted: 25 Apr 07 at 8:21pm
very bad idea to use gelcoat filler on the daggerboard, i seem to recall that from some other thread. use epoxy was the advice given then.
600 732, will call it Sticks and Stones when i get round to it.
Also International 14, 1318
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Adam.s View Drop Down
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Posts: 122 		Post Options Post Options   Quote Adam.s Quote  Post ReplyReply Direct Link To This Post Posted: 24 Apr 07 at 8:30pm
I have just finished attaching the broken off piece of foil. I am then going to fill a few of the scraps with gelcoat filler and i then plan to re spray with car primer. Now i am unsure of what sanding i will need to do, shall i give the whole foil a light sand and then spray plus do i need to sand after spraying. Plus how many coats of paint should i spray on, any help would be greatly appreciated!

Edited by Adam.s
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