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Posted by Mel on August 3, 2008, 7:30 pm
I stripped down a piece of oak furniture and put on two coats of spar
varnish. Now the wife wants a satin finish. I have spar urethane. If I
sand down the varnish then apply the urethane, will that work, or do I have
to strip off the urethane completely before applying the spar varnish?
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Posted by David Nebenzahl on August 3, 2008, 7:45 pm
On 8/3/2008 4:30 PM Mel spake thus:
> I stripped down a piece of oak furniture and put on two coats of spar
> varnish. Now the wife wants a satin finish. I have spar urethane. If I
> sand down the varnish then apply the urethane, will that work, or do I have
> to strip off the urethane completely before applying the spar varnish?
The varnish (urethane) should stick to the varnish (alkyd) with no
problem, especially if the varnish was just recently applied, as it
sounds like. Scuff it up w/sandpaper and you should be good to go.
--
"Wikipedia ... it reminds me ... of dogs barking idiotically through
endless nights. It is so bad that a sort of grandeur creeps into it.
It drags itself out of the dark abyss of pish, and crawls insanely up
the topmost pinnacle of posh. It is rumble and bumble. It is flap and
doodle. It is balder and dash."
- With apologies to H. L. Mencken
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Posted by Red Green on August 3, 2008, 9:00 pm
> I stripped down a piece of oak furniture and put on two coats of spar
> varnish. Now the wife wants a satin finish. I have spar urethane. If
> I sand down the varnish then apply the urethane, will that work, or do
> I have to strip off the urethane completely before applying the spar
> varnish?
>
>
The source of this info is weak. Not from a pro floor finisher, He had told
me clear gloss is a harder finish than satin gloss. Claimed if you want a
satin floor, put two coats of gloss then topcoat with satin.
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Posted by SteveBell on August 4, 2008, 12:54 pm
Red Green wrote:
>
> > I stripped down a piece of oak furniture and put on two coats of
> > spar varnish. Now the wife wants a satin finish. I have spar
> > urethane. If I sand down the varnish then apply the urethane, will
> > that work, or do I have to strip off the urethane completely before
> > applying the spar varnish?
>
> The source of this info is weak. Not from a pro floor finisher, He
> had told me clear gloss is a harder finish than satin gloss. Claimed
> if you want a satin floor, put two coats of gloss then topcoat with
> satin.
Gloss finishes topped with satin finish is a standard method.
What's not straightforward about this situation is using a different
chemistry for the topcoat. It's hard to say what will happen.
Put a coat of the spar varnish on some scrap wood, then coat it with
satin urethane. If you like the way it turns out, you have your answer.
Others have pointed out that you can make any gloss finish into satin
by careful use of abrasives. I usually do it with 1000-grit wet/dry
sandpaper. I use a solvent that doesn't dissolve the finish, like
mineral spirits for water-based urethane, or water for oil-based
varnish.
--
Steve Bell
New Life Home Improvement
Arlington, TX
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Posted by David Nebenzahl on August 4, 2008, 1:41 pm
On 8/4/2008 9:54 AM SteveBell spake thus:
> Others have pointed out that you can make any gloss finish into satin
> by careful use of abrasives. I usually do it with 1000-grit wet/dry
> sandpaper. I use a solvent that doesn't dissolve the finish, like
> mineral spirits for water-based urethane, or water for oil-based
> varnish.
You can safely use "mineral spirits" (i.e., naphtha, paint thinner,
etc.) or turpentine on oil-based varnish without damage, once it has
fully cured.
The only finishes that can be redissolved by solvents after they've
cured are lacquer (by lacquer thinner) and shellac (by alcohol).
--
"Wikipedia ... it reminds me ... of dogs barking idiotically through
endless nights. It is so bad that a sort of grandeur creeps into it.
It drags itself out of the dark abyss of pish, and crawls insanely up
the topmost pinnacle of posh. It is rumble and bumble. It is flap and
doodle. It is balder and dash."
- With apologies to H. L. Mencken
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