Varnishing Carbon Masts, what to use?
Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=13135
Printed Date: 18 Aug 25 at 11:01am Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com
Topic: Varnishing Carbon Masts, what to use?
Posted By: RS400atC
Subject: Varnishing Carbon Masts, what to use?
Date Posted: 04 Aug 18 at 10:20am
Is International 2 pot polyurethane still the varnish of choice?
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Replies:
Posted By: Cirrus
Date Posted: 04 Aug 18 at 12:41pm
White masts ... are of course faster.... 2 pot white not varnish !
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Posted By: RS400atC
Date Posted: 04 Aug 18 at 7:06pm
Originally posted by Cirrus
White masts ... are of course faster.... 2 pot white not varnish !
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Might not be faster to sell when the time comes!
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Posted By: Cirrus
Date Posted: 04 Aug 18 at 8:24pm
Might not be faster to sell when the time comes!
I would not be too sure of that at all ... scruffy varnished verses pristine paint (cos it lasts so much longer). And they are faster of course. Mainly just 'cold climate' buyers and carbon virgins (ie many UK dinghy types) think varnish on carbon is the bees knees. It is like black cars - look great in the showroom of course... and then you silly people take them outside, leave them to cook for months on end, and occasionally for some reason use them...
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Posted By: Sam.Spoons
Date Posted: 04 Aug 18 at 10:44pm
I'm with Cirrus, white painted CF masts are 'cooler' in both senses of the word. 
------------- Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish"
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Posted By: Cirrus
Date Posted: 05 Aug 18 at 3:27pm
I'm with Cirrus, white painted CF masts are 'cooler' in both senses of the word.
Forget
being cool unless you are millennial inclined ... but do remember they ARE faster !
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Posted By: RS400atC
Date Posted: 05 Aug 18 at 3:34pm
White paint on a spar which was sold varnished would suggest a poor repair covered up. If I were buying the boat, I'd rather see the carbon and see the epoxy hasn't been trashed. So, it will be a clear coating.
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Posted By: Sam.Spoons
Date Posted: 05 Aug 18 at 5:31pm
Good point but given that I usually keep my kit for ages (10 years so far for the Spice and no plans to move it on) I'd probably still paint it white.....
------------- Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish"
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Posted By: RS400atC
Date Posted: 05 Aug 18 at 8:47pm
Originally posted by Sam.Spoons
Good point but given that I usually keep my kit for ages (10 years so far for the Spice and no plans to move it on) I'd probably still paint it white..... |
Maybe 'll do the 400 mast white, what's the best primer for aluminium? :-)
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Posted By: Sam.Spoons
Date Posted: 05 Aug 18 at 9:12pm
Well they wouldn't be able to use a magnet to check like on car bodywork......
------------- Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish"
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Posted By: JimC
Date Posted: 05 Aug 18 at 9:39pm
Originally posted by RS400atC
White paint on a spar which was sold varnished would suggest a poor repair covered up. |
By complete contrast it would suggest to me someone who knows what they are doing and wants a spar to last. I am convinced that the reason varnish falls off carbon masts and white paint doesn't is because the inadequate UV protection from the varnish means the underlying epoxy is degrading and destroying the adhesion.
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Posted By: Sam.Spoons
Date Posted: 05 Aug 18 at 9:53pm
Also a good point, and a well finished paint job suggests that, if there is a repair, it has been well done......
Hmmmm, I'm confused now, but I'll still paint my carbon mast (if I can ever afford one) white when the time comes..... 
------------- Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish"
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Posted By: Guests
Date Posted: 05 Aug 18 at 10:10pm
Clear coat carbon is just to show off that you have carbon. But it’s mature technology now, so surely no need to boast about it. Could you vinyl wrap the mast, at least the stiff part below the hounds?
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Posted By: Daniel Holman
Date Posted: 05 Aug 18 at 10:24pm
With paint you will have to prime first then flat before paint and UV laquer, so more stages than laquer / varnish. Most masts are made male on mandrels so would look gash painted unless faired - more work. I've had reasonable success with durepox clear on carbon, rolled and tipped. Always goes best with a flat back and a glamour coat, but if sprayed in dust free environment its 2 coats job done
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Posted By: Rupert
Date Posted: 06 Aug 18 at 6:21am
I can see paint has UV advantages, but I'm not convinced white is so much better than another pale colour. Why not a pink mast, or a baby blue one? You could match a yellow hull, say, or maybe contrast a dark blue hull with an orange mast.
Interesting that one reason aluminium masts became so popular compared to wood was the lack of varnishing needed, but we have gone full circle.
------------- Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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Posted By: RS400atC
Date Posted: 06 Aug 18 at 7:02am
Originally posted by Daniel Holman
With paint you will have to prime first then flat before paint and UV laquer, so more stages than laquer / varnish. Most masts are made male on mandrels so would look gash painted unless faired - more work. I've had reasonable success with durepox clear on carbon, rolled and tipped. Always goes best with a flat back and a glamour coat, but if sprayed in dust free environment its 2 coats job done
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Thanks for that. I've used perfection in the past and it's lasted well.
I was hoping to avoid buying £45 worth just to do one mast. I think the debate about the merits of white are moot as the class rules are closed and permit only re-varnishing.So, re-varnished it will be.
I'm not a huge fan of carbon on show, it was 'modern' when my 1992 motorbike was new.
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Posted By: Sam.Spoons
Date Posted: 06 Aug 18 at 7:29am
You don't mention which boat but if class rules mandate clear 'varnish' then, as you say, the white/pink discussion is moot. 
------------- Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish"
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Posted By: Daniel Holman
Date Posted: 06 Aug 18 at 9:21pm
Originally posted by RS400atC
Originally posted by Daniel Holman
With paint you will have to prime first then flat before paint and UV laquer, so more stages than laquer / varnish. Most masts are made male on mandrels so would look gash painted unless faired - more work. I've had reasonable success with durepox clear on carbon, rolled and tipped. Always goes best with a flat back and a glamour coat, but if sprayed in dust free environment its 2 coats job done
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Thanks for that. I've used perfection in the past and it's lasted well.
I was hoping to avoid buying £45 worth just to do one mast. I think the debate about the merits of white are moot as the class rules are closed and permit only re-varnishing.So, re-varnished it will be.
I'm not a huge fan of carbon on show, it was 'modern' when my 1992 motorbike was new.
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Well, as I see it varnished carbon masts are the quickest honest to goodness way of providing visually acceptable UV protection on a male moulded carbon spar. Not the same as a halfords wheel arch trim on a saxo and all that sillyness.
£45 is peanuts when compared to doing it professionally, although most of the cost is in the prep.
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Posted By: RS400atC
Date Posted: 06 Aug 18 at 9:51pm
Perfection Varnish £46 and a few shillings from my local chandler, debate over.
The bits on the bike have lasted OK due to being smothered in chain lube and living in the garage. FWIW.
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Posted By: JimC
Date Posted: 07 Aug 18 at 6:56am
It would make sense for a number of members of a club to get together and use one common tin of two pot to recover all their masts...
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Posted By: jeffers
Date Posted: 07 Aug 18 at 11:45am
Originally posted by Daniel Holman
Originally posted by RS400atC
Originally posted by Daniel Holman
With paint you will have to prime first then flat before paint and UV laquer, so more stages than laquer / varnish. Most masts are made male on mandrels so would look gash painted unless faired - more work. I've had reasonable success with durepox clear on carbon, rolled and tipped. Always goes best with a flat back and a glamour coat, but if sprayed in dust free environment its 2 coats job done
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Thanks for that. I've used perfection in the past and it's lasted well.
I was hoping to avoid buying £45 worth just to do one mast. I think the debate about the merits of white are moot as the class rules are closed and permit only re-varnishing.So, re-varnished it will be.
I'm not a huge fan of carbon on show, it was 'modern' when my 1992 motorbike was new.
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Well, as I see it varnished carbon masts are the quickest honest to goodness way of providing visually acceptable UV protection on a male moulded carbon spar. Not the same as a halfords wheel arch trim on a saxo and all that sillyness.
£45 is peanuts when compared to doing it professionally, although most of the cost is in the prep.
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Had a quote of a couple of hundred notes for a prof respray, most of that was prep and they said there would likely be a discount of several of us got together.
------------- Paul
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D-Zero GBR 74
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Posted By: RS400atC
Date Posted: 08 Aug 18 at 7:26pm
Originally posted by jeffers
....
Had a quote of a couple of hundred notes for a prof respray, most of that was prep and they said there would likely be a discount of several of us got together.
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Interesting thought, but the job is done now, I've progressed from 'carbon mast needs varnishing , badly', to 'carbon mast, varnished, badly'. Most of the runs and stray bristles are above eye level when the boat's upright, so we'll live with it.
A poorly timed rain shower means I still need to put a second coat on the pointy end of a bowsprit.
Quicker and cheaper to do the job than take it elsewhere. It 's a shame so many people seem to let carbon masts get in a sordid state.
It's easier than working on boats in the winter, but suddenly we're dodging showers after 2 months of watching the lawn shrivel?
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