3M sandpaper

[Greg Newell]

I think that the milky haze is the very fine scratches that need to be buffed
out with a compound. Jeff Jewitt sold me a two step compound from a company
called Menzerna. Might want to call him on it.

Greg

Farrell wrote:

> Hi Mark. My first PSL piano - after a lot of sanding orange peel - has
> turned out quite nice. One question regarding the final rub-down for a satin
> finish. I sanded through with 400 grit fre-cut gold, followed by 600, and
> then 800 grit. Then I rubbed it down with the medium (gray - 400 grit type)
> 3M Scotch-Bright pad. Most of it looks real good, but some areas (maybe
> where I rubbed a little harder) have a bit of a milky appearance. It is
> definately not the clear finish that is milky - it was very clear before
> sanding - but rather a bit of a milky haze apparently from the final rub-out
> with the Scotch-Bright pad. Any ideas how to fix? How do you do your final
> satin rub-outs on the Oxford PSL?
>
> ----- Original Message -----
> From: <bases-loaded@juno.com>
> To: <pianotech@ptg.org>
> Sent: Wednesday, May 16, 2001 8:13 AM
> Subject: Re: 3M sandpaper
>
> Hi Greg -
>
> I have used the 216U paper you refer to exclusively for the last 4 pianos
> I have refinished, and I find it to easily be the best paper I have ever
> used.  I also have used Oxford's Premium Spray Lacquer on many occasions
> and have not had the trouble that you experienced.  I have found that it
> can be sanded safely, although somewhat gently, after a couple hours with
> no problem whatsoever.  Rubbing out after the final coats, though, is
> another matter.   At least a week is preferred, and two is even better,
> IMHO.
>
> I can only surmise that either:
>
> 1. the coat you applied was extremely heavy, in less than ideal
> conditions, and still had a soft belly after 24 hours;
> 2.  There was a contaminant left on the board that didn't allow the PSL
> to dry properly;
> 3.  You are pushing down way too hard when sanding.
>
> It is a good idea when sanding finishes between coats with dry paper to
> keep a piece of T-shirt handy to wipe off any accumulation on the paper
> every so often.  It will flake right off and prevent any build-up that
> will compromise your paper's ability to provide a good, even scratch
> pattern.  For the same reasons, wiping off the surface you are sanding of
> accumulated sanding dust is also beneficial.
>
> Mark Potter
> bases-loaded@juno.com
>
> On Wed, 16 May 2001 00:28:36 -0400 Greg Newell <gnewell@ameritech.net>
> writes:
> > Dear Lists,
> >     Not too terribly recently I read of the benefits of 3M's fre-cut
> > gold sand paper. I recently bought some from Jeff Jewitt who told me
> > to
> > use it between coats of Oxford Premium spray lacquer. I found that
> > it
> > began to remove some material and that material then balled up and
> > began
> > to cut grooves in my new soundboard finish! YIKES! I waited at least
> > 24
> > hrs before sanding between coats. Should i have waited longer? Is
> > there
> > a better way to use this highly acclaimed product? Are there
> > different
> > uses for this paper rather than between coats? I assume that it is
> > used
> > dry as it is a paper backing. Is that right? All was saved with a
> > scotchbrite pad and some careful rubbing. I applied the decal and am
> > now
> > ready at my next opportunity to spray over it. So far it looks
> > great!
> >
> > Greg
> > --
> > Greg Newell
> > Greg's Piano Forté
> > 12970 Harlon Ave.
> > Lakewood, Ohio 44107
> > 216-226-3791
> > mailto:gnewell@ameritech.net
> >
> >
> >

--
Greg Newell
Greg's Piano Forté
12970 Harlon Ave.
Lakewood, Ohio 44107
216-226-3791
mailto:gnewell@ameritech.net