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Polyurethane varnish on top of water based varnish.

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Rednadnerb

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Jun 21, 2013, 1:06:57 PM6/21/13
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Polyurethane varnish on top of water based varnish. Can I do this?

I have used water based quick drying varnish on a bare wooden front door which I now regret as I don't think it will be tough enough.

Would the water based varnish work as a primer or undercoat for a polyurethane varnish?

Thanks

Brendan.

Jim K

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Jun 22, 2013, 2:58:06 AM6/22/13
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Yes should do, I did beams in water based then decided I liked the sheen of spirit based & slapped it on top, no bother.

Jim K

Phil L

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Jun 22, 2013, 3:40:53 PM6/22/13
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Water or solvent is just the carrier of the coating left behind when the
carrier evaporates, so I'd say it will be OK.
Most fence preservers are water based and they work fine for years, even
when both sides are subject to all weathers.

I've recently worked on a pub and the bar top was stripped, then done in
water based varnish, and that has beer spilled on it continuously.


george - dicegeorge

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Jun 22, 2013, 3:40:33 PM6/22/13
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On 22/06/13 07:58, Jim K wrote:
> Yes should do, I did beams in water based then decided I liked the sheen of spirit based & slapped it on top, no bother.
>
> Jim K
>
is it the other way round when theres a problem?
water paints on top of oil paint?
[g]

F Murtz

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Jun 23, 2013, 12:30:45 AM6/23/13
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With art you can put oil on top of acrylic but not the other way round.
quite often oil paintings use acrylic for under coat.

polygonum

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Jun 23, 2013, 2:48:40 AM6/23/13
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Are you sure? My experience with water-based is that some of them are
remarkably tough. However I have not used it somewhere quite as extreme
as an exposed front door.

--
Rod

Vir Campestris

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Jun 24, 2013, 3:29:35 AM6/24/13
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On 22/06/2013 20:40, Phil L wrote:
> I've recently worked on a pub and the bar top was stripped, then done in
> water based varnish, and that has beer spilled on it continuously.

If you really want tough get two-pot epoxy yacht varnish from a
chandler. It's not cheap though.

Andy

fred

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Jun 24, 2013, 4:41:31 AM6/24/13
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No problem. About the only use I have for water based finishes is a water based sanding sealer. It dries quick and clean up is easy. After that it can be any finish you want.

Grimly Curmudgeon

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Jun 27, 2013, 2:47:36 PM6/27/13
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On Sun, 23 Jun 2013 14:30:45 +1000, F Murtz <hag...@hotmail.com>
wrote:

>
>
>With art you can put oil on top of acrylic but not the other way round.
>quite often oil paintings use acrylic for under coat.

Hmmm... if you get it wrong you can come down the next morning and
discover that you paintakingly created a craqueleur, entirely without
wanting to.
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