On Thu, 22 Apr 2021 15:31:36 -0500, Leon lcb11211@swbelldotnet
wrote:

On 4/22/2021 3:20 PM, Leon wrote:
On 4/22/2021 2:48 PM, no one wrote:
Like an idiot I stained and finished our new wood window casing & sills
with Shellac several years ago. Now of course the sun & exposure has
pretty
much taken their toll & I need to refinish.

I don't want a urethane since that yellows over time. I was thinking
about
a pre-cat laquer or a water based polyurethane or varnish. Any
preferences?
I'm leaning to the poly. It will be brushed on.



Unless you use an opaque finish like PAINT, the sun will continue to
takes its toll on translucent finishes.


And to take this a little further, you say that you do not want to use a
urethane finish. But then mention possibly using a polyurethane.

Polyurethane is urethane with additives.
If you do not want urethane, you also don't want polyurethane and or "poly"

Urethane's and polyurethane finishes do not necessarily turn yellow over
time. Oil based polyurethane finishes tend to yellow immediately and
more so over time. Water based polyurethane finishes tend to be crystal
clear and remain that way.

Varnish is a relative broad and generic term for most any relatively
clear finish including "shellac".

Finishes that allow sun to penetrate, relatively clear finishes, will
break down more quickly than opaque finishes, like paint. Paint does
not allow UV rays to penetrate like clear finishes.

Had water based poly on the sill of a bay window, it of course had
plants they were on 12 x 12 tiles. The sun exposed poly darkened or
did the stuff under the tile lighted????? You could see the outline of
the tile when we moved out. If it was my sills I would look for some
Rock Hard floor varnish. But that may be a gone company.