Repair & maintenance: High Build Bottom Coating?

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High Build Bottom Coating?

Printed From: Yachts and Yachting Online
Category: General
Forum Name: Repair & maintenance
Forum Discription: Questions & tips on the subject
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=9269
Printed Date: 14 May 25 at 4:10pm
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Topic: High Build Bottom Coating?

Posted By: G.R.F.
Subject: High Build Bottom Coating?
Date 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..

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Replies:

Posted By: olly_love
Date 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,

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TWO FRANK-Hunter Impala

Posted By: G.R.F.
Date Posted: 30 Apr 12 at 12:24pm

http://www.watco.co.uk/watco-high-build-epoxy.html - Will this stuff do the job?

http://www.promain.co.uk/product/PPG_Amercoat_385_id3995 - Or maybe this is better?

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Posted By: JimC
Date 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?

Posted By: G.R.F.
Date 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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Posted By: JimC
Date 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.

Posted By: I luv Wight
Date 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.

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Andy P
foiling Int Moth GBR3467
Freedom 21 Codling