High Build Bottom Coating?

So whilst I get to grips with the v2, I've got the Alto up ended at home and want to resurface the bottom, she's got a few beach scratches, surprisingly nothing too serious, other than a big scrape at the stern where she came unhitched from a particularly dodgy trailer when I picked her up last time the bottom was resurfaced professionally.

Which brings me neatly to the question, this stuff they must have used, was referred to as 'high build' all I seem to be able to google is a primer called high build used in the car Industry, surely it can't be that?

So what is it and where can I get it, or suggest something more suitable. Its an epoxy boat that the gel coat didn't bond particularly well too and stripped off during a particularly breezy round island race.

OH and does it have to be sprayed on? I don't have paint spraying kit, I'd hoped to apply with a brush then sand it..

Edited by G.R.F. - 30 Apr 12 at 8:32am

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G.R.F. Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 10 Aug 08 Location: United Kingdom Online Status: Offline Posts: 4028	Post Options Post Reply Quote G.R.F. Report Post Quote Reply Topic: High Build Bottom Coating? Posted: 30 Apr 12 at 8:32am
	So whilst I get to grips with the v2, I've got the Alto up ended at home and want to resurface the bottom, she's got a few beach scratches, surprisingly nothing too serious, other than a big scrape at the stern where she came unhitched from a particularly dodgy trailer when I picked her up last time the bottom was resurfaced professionally. Which brings me neatly to the question, this stuff they must have used, was referred to as 'high build' all I seem to be able to google is a primer called high build used in the car Industry, surely it can't be that? So what is it and where can I get it, or suggest something more suitable. Its an epoxy boat that the gel coat didn't bond particularly well too and stripped off during a particularly breezy round island race. OH and does it have to be sprayed on? I don't have paint spraying kit, I'd hoped to apply with a brush then sand it.. Edited by G.R.F. - 30 Apr 12 at 8:32am
	https://www.ease-distribution.com/

olly_love Send Private Message Find Member's Posts Really should get out more Joined: 18 Jan 05 Location: United Kingdom Online Status: Offline Posts: 1145	Post Options Post Reply Quote olly_love Report Post Quote Reply Posted: 30 Apr 12 at 8:41am
	highbuild is a "heavy" primer, that you spray on then flat back before a top coat, but its a filling and fairing coat, give any car spray shop a call they will be able to spray it for you for very little cash if you do the prep work,
	TWO FRANK-Hunter Impala

G.R.F. Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 10 Aug 08 Location: United Kingdom Online Status: Offline Posts: 4028	Post Options Post Reply Quote G.R.F. Report Post Quote Reply Posted: 30 Apr 12 at 12:24pm
	Will this stuff do the job? Or maybe this is better? Edited by G.R.F. - 30 Apr 12 at 12:27pm
	https://www.ease-distribution.com/

JimC Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6660	Post Options Post Reply Quote JimC Report Post Quote Reply Posted: 30 Apr 12 at 12:38pm
	I'm not clear on how the boat is finished at the moment: is it still gel coat or was the gel coat stripped off and the boat refinished with filler and paint? Edited by JimC - 30 Apr 12 at 12:39pm

G.R.F. Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 10 Aug 08 Location: United Kingdom Online Status: Offline Posts: 4028	Post Options Post Reply Quote G.R.F. Report Post Quote Reply Posted: 30 Apr 12 at 2:13pm
	Yes, the gel coat fell off, and what was left got stripped then they refinished with something they called high build which can't be the car stuff but I imagine must be some epoxy grade filler.
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JimC Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6660	Post Options Post Reply Quote JimC Report Post Quote Reply Posted: 30 Apr 12 at 2:25pm
	It will be some kind of high volume low density filler then. If you're just looking to touch it up then I'd fill the scratch with any epoxy based filler and paint over the top. Personally I always have enough epoxy and filler knocking about that I make my own up. I'm no expert on the various paints available: why not ask the guys who did it what they used... I've never felt the need to spray the filler for scratches and the like - a palette knife or something and hard work sanding after should do. Edited by JimC - 30 Apr 12 at 2:27pm

I luv Wight Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 28 Jan 05 Location: United Kingdom Online Status: Offline Posts: 628	Post Options Post Reply Quote I luv Wight Report Post Quote Reply Posted: 30 Apr 12 at 2:36pm
	Hi-Build is SP302 ( or whatever SP is these days ) - an epoxy high build undercoat, you can brush, roller, spray it. It's soft to sand and reasonably hard when cured, and you can get a smooth (not polished) finish. Another option is Durepox - a polyurethane/epoxy undercoat, that goes hard and can be polished. Automotive high build is polyurethane or acrylic, - softer, but easier and quicker to apply and finish. OK with a harder topcoat on.
	http://www.bloodaxeboats.co.uk Andy P foiling Int Moth GBR3467 Freedom 21 Codling