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Paramedic View Drop Down
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    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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Posts: 1502 		Post Options Post Options   Quote redback Quote  Post ReplyReply Direct Link To This Post 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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Originally posted by redback

its supposed to be faster than polished.


Not by anyone who's actually done testing.
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Posts: 228 		Post Options Post Options   Quote allanorton Quote  Post ReplyReply Direct Link To This Post Posted: 29 Apr 07 at 8:22am

Originally posted by JimC

Originally posted by redback

its supposed to be faster than polished.


Not by anyone who's actually done testing.

I've always thought that a shiny, high plished finish is best, but recent pics. of americas cup boat keels seem to show a matt finish?
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Posts: 1502 		Post Options Post Options   Quote redback Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 07 at 12:02am
I know it doesn't apply to sailing boats but power boats entering speed events alway rough up the hull just aft of the bow.
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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: 01 May 07 at 6:46pm
do you know why redback?
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Posts: 1251 		Post Options Post Options   Quote BBSCFaithfull Quote  Post ReplyReply Direct Link To This Post Posted: 01 May 07 at 10:07pm
Umm cos the rough surface created a layer of airbubbles under the back of the boat or something

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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: 02 May 07 at 5:25pm
so that would not work on a dinghy, far too slow.
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Posts: 2965 		Post Options Post Options   Quote Jack Sparrow Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 07 at 6:31pm
laminar flow. The skin friction is reduced by attaching a layer of water ( microns ) close to hull on which the rest of the water flows over.
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Jack Sparrow View Drop Down
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Posts: 2965 		Post Options Post Options   Quote Jack Sparrow Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 07 at 6:55pm
I would imagine the america's cuppers are using a riblet surface which would give a impression of a matt surface ( NASA invention ) most commonly seen on Sharks and Olympic Austrailan Swimmers with big feet.

http://www.aerodyn.org/Drag/riblets.html

Roughing the hull is essentially a poor mans version and you need to keep the scratches in line with the flow.
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