I was recently redoing my hardwood floor and I had just coated the
first layer of poly and used a buffer with a screen to abraid the
surface to put a second coat. In the process the screen cut to
aggresively in some spots and whent through the finish and a little bit
of the stain causing a blotchy appearance. Any suggestions short of
redoing the entire project.
If you sanded off the finish and stain, I think you are in for a
strip/refinish unless you can live with the appearance of different
colors of stain where you have restained before recoating. Since the
wood has had a coating on it, the resins/oils that the coating has left
behing will leave large witness lines around evey area you
The best hope is to try and use some toned (colored) finish. Take some
of the same poly and add some transtint or other dye abut 1/2 as dark
as the original stain. Hand apply very thin cotas and hand sand it out
and try to feather the edges. A few coats to build up to a similar
color and with a lot of luck and skill you "might" save the day.
I can pull this off about 1/3 of the time. I had one success on a table
top recently but had to completly redo a drawer on the same project.
Sigh... it almost never works for me. *Especially* not with anything
poly. After consulting the manufacturer rep, I don't sand between
coats anymore when using poly. BUT, I do not do floors unless it is
just a room or two.
Although the manufacturer's rep had some problem with this, method, I
do not. If brushing, I do not thin. If spraying, I thin as needed.
But in any event, I get s second coat on in no more than 8 hours before
the first coat is applied. No sanding.
Same with the third coat, if needed.
But timing is everything. I couldn't do it if it were a weekend
project as I would have to time too carefully. But since it is what I
do as part of my biz, I can put a coat on first thing in the morning,
then one at the end of the day.
If I am spraying, I put a thinned tack coat on, then about thirty
minutes or so later I put on a really heavy coat. Heavy for me anyway.
It probably isn't more than about 4 mil. If applied thirty to forty
five minutes, though, it will bond easily to the first coat to get a
nice film build. Often times that puts enough hide on something
(doors, heavy use table tops, etc. that benefit from poly) to get a
good finish on it. If it needs more, it is easy to scuff sand that
much finish without going through to apply more finish.
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