No sealer before polyurethane
 

Hi,

This article mentions "no sanding sealer before polyurethane", but it's
the only article that I found that states that.

http://doityourself.com/info/furniturerefinseal.htm

Is that so? No sealer before polyurethane?

(How about a light sanding after stainer?)

Thanks!

Aaron Fude

No sealer before polyurethane
 

wrote in message
oups.com...
Hi,

This article mentions "no sanding sealer before polyurethane", but it's
the only article that I found that states that.

http://doityourself.com/info/furniturerefinseal.htm

Is that so? No sealer before polyurethane?

(How about a light sanding after stainer?)

Thanks!

Aaron Fude


Don't believe everything you read on-line (including responses from this
group). When in doubt, go to the manufacturers website and research the
product you want to use.

Here is Minwaxes response:

http://www.minwax.com/products/woodprep/sand-seal.cfm

Dave

Sanding Sealer before Poly.
 

My wife does our finishing work. She follows this procedure with excellent
results.: Step 1 stain, Step 2 Sanding Sealer, Step 3 light sanding of
sealer with steel wool, then begin to build up coats with more poly. Steel
wool in between coats. Poly must be well dried or steel particles can get
lodged in soft poly.

In addition to building custom cabinets we also restore classic mahogany
boats. I do the boat finishing. I do not use sanding sealer, I use a 50%
diluted solution of the poly varnish as a primer. Then apply two full
strength coats of Poly before doing any sanding between coats. I apply 8
coats generally sanding between coats only when needed.

To sand seal or not in my opinion is all a matter of what process you work
out that gives you the consistent results you are seeking and you just keep
practicing to get good at it .

We do not sand after staining it could cause light and dark spots,
especially on sharp edges.

Don Dando



wrote in message
oups.com...
Hi,

This article mentions "no sanding sealer before polyurethane", but it's
the only article that I found that states that.

http://doityourself.com/info/furniturerefinseal.htm

Is that so? No sealer before polyurethane?

(How about a light sanding after stainer?)

Thanks!

Aaron Fude

No sealer before polyurethane
 

wrote in message
oups.com...
Hi,

This article mentions "no sanding sealer before polyurethane", but it's
the only article that I found that states that.

http://doityourself.com/info/furniturerefinseal.htm

Is that so? No sealer before polyurethane?

(How about a light sanding after stainer?)


Just like the warning on your lawnmower to keep your fingers out of the
blade, the warning is given because some nimrod is likely to use a stearated
sanding sealer and then complain. If you use a sealer, versus a sanding
sealer, which is normally stearated, and even feels a little soapy, no
problem.

Sanding after staining can really mess the surface. I'd rather scuff the
first coat of dilute poly, which can be used as a sealer.

No sealer before polyurethane
 

George wrote:

Just like the warning on your lawnmower to keep your fingers out of the
blade, the warning is given because some nimrod is likely to use a stearated
sanding sealer and then complain. If you use a sealer, versus a sanding
sealer, which is normally stearated, and even feels a little soapy, no
problem.

Sanding after staining can really mess the surface. I'd rather scuff the
first coat of dilute poly, which can be used as a sealer.

As George says, a diluted coat of the finish itself can be used as an
excellent sealer, if time is not a factor.

The OP should ask him or herself WHY a sealer?

Sanding sealers are typically used to speed the sanding / finish
building process, before more expensive, less sandable, and sometimes
much slower drying finish coats are applied. A good sealer can often be
sanded within the hour.

If the final goal is an open-pored look on red oak, a sealer may not be
necessary at all, or the diluted finish might be perfect. If I'm
looking for a bowling alley mirrored surface, I might take most of the
early coats of real sanding sealer off with 150 or 220 grit, before
ending with a 320 or 400 grit scuff of the last coat. Genuine sealers
let me do this in one day, diluted poly takes a lot longer, as each
successive coat needs a lot more time to sand without "pilling".

I've found that the better sealers will mention right on the label if
they are usable under polyurethane. For instance, Zinsser Quick 15
states right there on the label that it's stearated and lists the
products it's intended to be used under. I'm pretty sure it even says
"not for polyurethane" in bold face print.

My absolute favorite, truly universal, sanding sealer is Zinsser Seal
Coat, which happens to be a simple premixed 2 lb. cut of dewaxed
shellac. Seal Coat works GREAT under any finish where you'd use a
sealer, and is well worth the time to learn to use. Learn it, and
stock ONE product. It can be sprayed right out of the can, applied with
a foam brush or rubbing pad, or a good quality paint brush.

I've dedicated several brushes to shellac (and Seal Coat). When I'm
done using them, I let them dry. Before the next use, I drop them in
alcohol, and in 15 minutes they're ready to go.

In most cases, with the exception of Seal Coat, I try to stick with one
brand of finishing product on one project. For example, if I'm using
Behlen (Mohawk) lacquer, whenever possible, I'll use their toners and
stains. If I'm applying a Waterlox, Pratt & Lambert, Sherwin Williams,
etc... varnish over someone else's stain, I'll make sure there's a
barrier coat of Seal Coat between them.

As usual, PRACTICE on SCRAP! G

Any time you're unfamiliar with a process, keep a test board (of decent
size, NOT 3"x4" G) available, do _every_ step to the test control,
including sanding, and write the steps and notes on the back. ONLY when
the step is successful on the test board should you do it on the
project. Great finish? Save the board so you remember the steps next
time, and to show the "customer" (even if it's yourself and the wife)
what the finish will look like.

A good finish really makes your great work look as great as it really
is, don't rush it. Take the time to really get to know what you're
doing. Nowadays, I typically consider a project about half done when I
start finishing. As a beginner, I was almost done!

Have fun!

Sanding Sealer before Poly.
 

Don Dando wrote:


To sand seal or not in my opinion is all a matter of what process you work
out that gives you the consistent results you are seeking and you just keep
practicing to get good at it .

Truer words are rarely spoken. G

No sealer before polyurethane
 

For other than utility furniture, and even some of that, think cabinet
scraper rather than sanding. Much nicer job.

J

No sealer before polyurethane
 

No sealer before polyurethane
 

Barry,
While not for furniture, I use SEAL COAT frequently. For me, the typical use
it to coat & seal my hardboard templates. Both the 1/8in 'drawing' and the
1/4in 'router'. Extra 'protection' coats go on the edges.

Contrary to the 'experts' my favorite brushes are the 'disposable CHIP'
brushes for Epoxy, and the foam ones for Varnish. {YES - goes against what
all the 'pundits' say . . . but it's really technique & care that counts !}.
When I first started to use the SEAL COAT, a foam brush was what I used. As
I proceeded I noticed little BLACK bits in the finish . . . Turned out that
the ALCOHOL was DISINTEGRATING the foam brush !!! I then switched to the
'chip' brushes and no problems.

So the question is . . . what 'type' of FOAM brush are you using ???

Regards & Thanks,
Ron Magen
Backyard Boatshop

"B A R R Y" wrote
SNIP
My absolute favorite, truly universal, sanding sealer is Zinsser Seal
Coat, which happens to be a simple premixed 2 lb. cut of dewaxed
shellac. . . .
SNIP

.. . . applied with a foam brush . . . .

No sealer before polyurethane
 

Ron Magen wrote:
Barry,
While not for furniture, I use SEAL COAT frequently. For me, the typical use
it to coat & seal my hardboard templates. Both the 1/8in 'drawing' and the
1/4in 'router'. Extra 'protection' coats go on the edges.

Good idea.

So the question is . . . what 'type' of FOAM brush are you using ???

The black no-name ones I get from Coastal Tool in 36 brush boxes. I
haven't had a problem, yet. G

No sealer before polyurethane
 

Hi,

Thank you everybody for responding!

I must admit that most of the responses went right over my head and I
feel woefully overmatched. But to remedy that feeling, I might as well
ask a couple of questions:

1. When you say "diluted poly" diluted with what?
2. When you talk about steel wool - what grade? I went to home depot
and found several gradations. And what is the pupose of using steel
weel between coats?

Thanks!

Aaron Fude

No sealer before polyurethane
 

No sealer before polyurethane
 

wrote in message
oups.com...
Hi,

Thank you everybody for responding!

I must admit that most of the responses went right over my head and I
feel woefully overmatched. But to remedy that feeling, I might as well
ask a couple of questions:

1. When you say "diluted poly" diluted with what?
2. When you talk about steel wool - what grade? I went to home depot
and found several gradations. And what is the pupose of using steel
weel between coats?


Paint thinner to if you're using oil-based poly. Don't know if the
water-based responds well to thinning/dilution.

Avoid steel wool. Gets little stickers in your hand, leaves crap all over
the place as it crumbles, and with some acid woods, can sneak in and turn an
area black later.

Two things in sanding between coats. First is level, where you have brush
strokes, bubbles and such to knock off. Best to use a backed sandpaper with
a bit of lube to keep clean for this. Second is tooth, where you scuff to
gain mechanical grip for the next coat. You may use the level method or a
soft-backed flexible sanding sponge for this if you're level. You're just
trying to destroy the gloss a smooth surface gives, so the next coat can
adhere.

On the last coat, lots of people like to randomize the surface with some
abrasive. Cuts down on surface reflection without introducing light-scatter
in the finish itself as "satin" type varnishes do. I prefer to just use
wax, where the polymer size gives me a bit of scatter, but the film is only
a few thick.

No sealer before polyurethane
 

wrote in message
oups.com...
Hi,

Thank you everybody for responding!

I must admit that most of the responses went right over my head and I
feel woefully overmatched. But to remedy that feeling, I might as well
ask a couple of questions:

1. When you say "diluted poly" diluted with what?
2. When you talk about steel wool - what grade? I went to home depot
and found several gradations. And what is the pupose of using steel
weel between coats?

Thanks!

Aaron Fude

I have used the following process with very good results.
I apply (liberally) Watco Danish Oil, following instructions on the can.
After I wipe it down really well, I let it set for a day.
Next day I apply a coat of polyurethane. (I use satin finish most of the
time). If I've applied the poly in the morning, it's usually dry enough to
sand in the late afternoon.
I use 320 grit. I only sand enough to knock down the little fibers that
stick up. I wipe it down thoroughly with a tack rag. and apply another coat
of poly.
I always apply thin coats and the number of coats depend on what the
particular project is.
I should mention that I've done some projects that I only use Danish oil on
and I apply a couple of coats.
There are those who say that anything past the first coat of Danish oil is
superfluous but if that's the case then the extra rubbing must be what
brings out the nicer finish.

Max