Finish problems again....

mcgyver · Joined: 01 Aug 2007 Posts: 2

Spraying a piece with nitrocellulous pre cat lacquer, have about 50/50
results over the past 2 gallons. problem is that i have to wait for a
"nice" day because i have to spray outside. thought today would be fine
here in the northwest, hasn't rained for days, temp got to 45-50 degrees.
and damn got a blush finish! i'm ready to try my hand at another type of
finish, I've heard of conversion varnishes...what are they? sprayable?
durable? would i get in the same trouble with say an Oxford waterborn
lacquer? I'm always dealing with temperature and humidity problems where i
live and would like suggestions. thanks

Archived from group: rec>woodworking

Mike Marlow · Joined: 01 Aug 2007 Posts: 114

"mcgyver" wrote in message $w94.1440@pd7urf2no...
> Spraying a piece with nitrocellulous pre cat lacquer, have about 50/50
> results over the past 2 gallons. problem is that i have to wait for a
> "nice" day because i have to spray outside. thought today would be fine
> here in the northwest, hasn't rained for days, temp got to 45-50 degrees.
> and damn got a blush finish! i'm ready to try my hand at another type of
> finish, I've heard of conversion varnishes...what are they? sprayable?
> durable? would i get in the same trouble with say an Oxford waterborn
> lacquer? I'm always dealing with temperature and humidity problems where
> i live and would like suggestions. thanks
>

First suggestion when dealing with humidity problems - stay away from
lacquer.

--

-Mike-
mmarlowREMOVE@alltel.net

nailshooter41 · Joined: 01 Aug 2007 Posts: 229

On Feb 25, 10:49 pm, "Mike Marlow" wrote:

> First suggestion when dealing with humidity problems - stay away from
> lacquer.

I am sitting here laughing my ass off.

This from the guy that finally got me to shoot poly, told me how to
"hang" a second coat successfully (I thought it was folklore) and you
are telling someone to stay away from a finish?

Too damn funny.

But on the other hand, it could be good advice....

I just figure that is someone else is doing something day in and day
out (like finishing with a certain product) I ought to be able to at
least get in the game.

I am still laughing. Maybe it was your delivery.

Robert

Mike Marlow · Joined: 01 Aug 2007 Posts: 114

wrote in message @71g2000hse.googlegroups.com...
> On Feb 25, 10:49 pm, "Mike Marlow" wrote:
>
>> First suggestion when dealing with humidity problems - stay away from
>> lacquer.
>
> I am sitting here laughing my ass off.
>
> This from the guy that finally got me to shoot poly, told me how to
> "hang" a second coat successfully (I thought it was folklore) and you
> are telling someone to stay away from a finish?
>
> Too damn funny.
>
> But on the other hand, it could be good advice....
>
> I just figure that is someone else is doing something day in and day
> out (like finishing with a certain product) I ought to be able to at
> least get in the game.
>
> I am still laughing. Maybe it was your delivery.
>

Admittedly, it was a little tongue in cheek...

--

-Mike-
mmarlowREMOVE@alltel.net

B A R R Y · Joined: 01 Aug 2007 Posts: 441

nailshooter41@aol.com wrote:
>
> When lacquer works as advertised, it is a thing of beauty. Easy to
> apply, easy to repair, and easy to build coats.

I've found "dew point spread" to be more reliable than looking at
temperature and humidity.

A 70F day, with a dew point of 52F is an 18 degree spread. A 70F day
with a 62F dew point is an 8 degree spread. The dew point is commonly
available on most weather web pages. I live near two small airports, so
I dial up the automated weather systems, which are updated once a
minute. Weather Underground (wunderground.com) will grab local airports
and rapid fire update it, based on the user's zip code.

Many NC lacquer vendors recommend 20 degrees spread, I've gotten away
with 15 several times. Most product information sheets, available at
the finish mfg's web site, will contain such information, much more than
is usually printed on the can.

On colder days with the proper spread, fast thinners will work fine in
NC lacquer, with no blushing. People sometimes get caught on cool days
by what they think is low humidity, but in reality, the dew point is too
high.

I don't spray water base under 72F without warming the finish in a water
bath. I'll use the water bath down to ~ 65F. Below 65F, I don't spray
WB at all. 1000 watt worklights will also slightly warm the work
surface, helping WB flow-out. WB does not seem to be very humidity
sensitive, but the folks who live in the humid places like Houston, or
the very dry deserts see extremes that I don't see.

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