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Dinghy hull coatings
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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 Topic: Dinghy hull coatings
    Posted: 13 Dec 13 at 9:09pm
Farecla do a wide range of polishes.

The G series are really aimed at paintwork, but are effective on GRP too. G6 is the polish to use, G3 is a bit too fine. G10 is great for finishing dark colours.

the profile range is designed for use on gelcoat. 100 is seriously coarse, 200 less so etc etc.

Profile 100 is supposed to polish 600 grit wet/dry but needs to be followed up with a finer polish for the same result as 1200/G6 + elbow grease. It's probably better on dark colours.

Both systems have their merits. I think that the profile range will get you a result quicker, but you use more different materials.
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Posts: 85 		Post Options Post Options   Quote deadrock Quote  Post ReplyReply Direct Link To This Post Posted: 14 Dec 13 at 6:44pm
A chap at Draycote in the 1970s, I think his name was was Mike Sharp(e): his Laser was a little too scratched for his liking, so he got a drill-based circular sander and a sheepskin mitt, daubed it with T-cut, and started to polish out the scratches. He stopped when his hull started to change colour.
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Posts: 2143 		Post Options Post Options   Quote getafix Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 14 at 7:25pm
Just watching the One Show, now I know what I need, a coating that makes my beloved 100 super-hydrophobic, looks flipping quick!
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Posts: 392 		Post Options Post Options   Quote iitick Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 14 at 7:32pm
Hydrophobic? You been bitten by a mad dog?
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Dougal View Drop Down
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Posts: 556 		Post Options Post Options   Quote Dougal Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 14 at 10:14pm
The One Show? You been bitten by a mad dog?
What could possibly go wrong?
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getafix View Drop Down
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Posts: 2143 		Post Options Post Options   Quote getafix Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 14 at 10:49am
No madness, I think this would make your hull extremely slippery through the water but still enable you to get on the board, hold the boat securely... http://www.youtube.com/watch?v=IPM8OR6W6WE 
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Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 18 Jan 14 at 2:36pm
I can see that tell tales will never need to stick again. Would it be race legal on a hull?
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Posts: 2143 		Post Options Post Options   Quote getafix Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 14 at 9:22am
Originally posted by Rupert

I can see that tell tales will never need to stick again. Would it be race legal on a hull?

Quite sure the luddites will try to ban this type of coating, but it could have an incredibly significant impact on hull design and by association, rig design, for many a year.  If hulls today are designed to be pushed through the water (or push water out of the way in certain aspects) then imagine if water simply runs over the surface with practically no, or very little friction generated ... we could see a return to really wide platforms, able to carry much larger rigs (by dint of having better righting moment) and greater stability with more pronounced 'spray rails' to deal with the faster flow over surfaces we would see?  Greater velocity through the air would also mean a flatter sail profile and make wing rigs even more practical, just as we have seen with foiling.  Foil design will also have to change.....
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 14 at 11:23am
Water is still going to need to be pushed out of the way no matter what, because the boat will by necessity have to be sitting in a hole in the water. All it can possibly affect is skin friction, which is a fairly small part of design.
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Rupert View Drop Down
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Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 20 Jan 14 at 11:45am
This stuff doesn't actually change the laws of physics...

I have visions in my head of the boat hating water so much when you spray this stuff on that it refuses to be pushed into the water at all! Six strong men trying to launch a Topper, and it not budging an inch.
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