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10 year varnish

10 year varnish

by VirtualVagabond » Tue Dec 08, 2009 4:04 am

I'm trying to locate a thread I read a while back regarding a process for making outside varnish last longer than the usual 12-24 months.
The comment was that by using a MAS product together with the varnish and with good preparation, the result would be good for around 10 years.
It sounded incredible to me at the time, but I'd like to re-read it, if I can find it.
Anyone remember it?
Vic
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Re: 10 year varnish

by DzerWogs » Fri Aug 27, 2010 8:59 pm

Let me know if you find that thread as I would love to hear about it.

D
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D & Don
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Re: 10 year varnish

by chuck » Sat Aug 28, 2010 9:06 am

Vic, If you read it on the internet it must be true. When you find it I would really like to read it too. Chuck
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Re: 10 year varnish

by Tambadil » Thu Dec 02, 2010 11:39 am

Ahhhh...the quest for the holy grail of "long lasting" varnish. Let me know if you guys found any magic. One online technique suggests that if you follow the process below, you should only need two coats of Poly per year.

1) Sand old layers down (paper 80) until bare wood
2) Sand (120) then (240)
3) Clean up dark spots on wood, presence of root, with Oxalic Acid
4) Remove dust with a wet sponge
5) Use stain if required ''Clear Oak''
6) Sand (240)
7) Remove dust
8) Apply first layer of Polyurethane bi-composant varnish
9) Sand (400)
10) Apply 2 layers of Polyurethane bi-composant varnish
11) sand (400)
12) Apply 2 layers of Polyurethane bi-composant varnish
13) sand (400)
14) Apply 2 layers of Polyurethane bi-composant varnish
15) sand (400)
16)Apply 2 layers of Polyurethane bi-composant varnish

Finished. Your boat is ready for 10 years of long lasting beautiful shine!!!! Just add 1-2 top coats per year.
------------------------------------------------
Best regards,

Chad & Carolyn

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Re: 10 year varnish

by chuck » Thu Dec 02, 2010 12:19 pm

yeah right, We can do about the same with Cetol and a whole lot less sanding, about four times according to your instructions, and prep. Chuck
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Re: 10 year varnish

by RichH » Tue Dec 07, 2010 2:58 pm

For 10+ year longevity would most heartily recommend "honey teak" for exterior coating over teak. http://www.signaturefinish.com

Such needs a yearly quick overcoat of the 2 part clear. just 'scuff' with a 3M pad and then overcoat. I double coat every 2 years and power buff in the intervening year.
HT base coat needs to be applied THICK for UV protection of the surface wood cells. Good thing is that its catalyzed 2-part so you can put on several coats in one day. Mfgr. recommends 2 base coats, I found 3 THICK base coats results in a longer lasting coating. Best to apply on cool low humidity days to get better 'flow-out'. Wind across the wetted work increases the reaction time. Im currently re-doing an 11 y/o HT job ... not because of HT failure but because 'water bleed - black' through scarfs, joins, plugs, etc.

Best of all its an acrylic/urethane copolymer, LOOKS LIKE 'prime' oil-based VARNISH, can be power-buffed or flat sanded (2000 grit) then 'hand rubbed' (rottenstone & water to develop 'patina' or a glowing iridescence of the wood) to an incredible mirror-flat gloss (if you want make a Hinckley blush with envy); easily repaired, doesnt hide the wood grain. Can be 'finished' to a museum-grade or mega-yacht type 'finish'.
Downside is it wont cure well when applied in high humidity, cracks if scarfs, etc. 'work' ... VERY EXPENSIVE but when you amortize over ~10 years its comes out being the 'cheapest'. Does 'run' sag on verticals ... so requires many thin coats on the verticals.

I own a 'teakey' and Id rather be sailing than 'varnishing'.

:-)
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