Varnish not drying


C

Colin

I recently varnished a sign (indoors) with some international yacht varnish.
2 days later the varnish is still tacky. The pot says that the varnish
should be dry within 4 hours.
The wood is an old kitchen door (American Oak). I did not strip the original
coat of varnish, just sanded it down to provide a key.

Any ideas why the drying time is soo long?

I have noticed this problem in the past with other projects, where the first
coat always seems to take longer...

Any way of speeding up the drying?

TIA Colin
 
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M

Mike Halmarack

I recently varnished a sign (indoors) with some international yacht varnish.
2 days later the varnish is still tacky. The pot says that the varnish
should be dry within 4 hours.
The wood is an old kitchen door (American Oak). I did not strip the original
coat of varnish, just sanded it down to provide a key.

Any ideas why the drying time is soo long?

I have noticed this problem in the past with other projects, where the first
coat always seems to take longer...

Any way of speeding up the drying?

TIA Colin
I had a similar problem when using some varnish I'd bought from B&Q.
I'd painstakingly stripped a framed and many paneled bureau with
paint stripper and various scrapers. After washing, drying and rubbing
over with wire wool, I applied the varnish. A month later it was still
slightly tacky to the touch. I was quite miffed to get this result
after all the work I'd put in. I covered it with a dust sheet for a
couple of months more , after which it became serviceable.
I don't know what the cause was. I wanted to blame B&Q but never
became sufficiently convinced.
 
R

Rosie

Colin said:
I recently varnished a sign (indoors) with some international yacht varnish.
2 days later the varnish is still tacky. The pot says that the varnish
should be dry within 4 hours.
I did this - painted a table with yacht varnish and it never dried. I was
told that proper yacht varnish doesn't dry properly, so that the deck of the
boat doesn't get slippy. I've no idea whether that was true. I ended up
stripping it and starting again with a proper interior varnish.

ROSIE
 
S

stuart noble

Rosie wrote in message ...
I did this - painted a table with yacht varnish and it never dried. I was
told that proper yacht varnish doesn't dry properly, so that the deck of the
boat doesn't get slippy. I've no idea whether that was true. I ended up
stripping it and starting again with a proper interior varnish.
Probably "trapped" solvents. If too much is applied in one coat, the surface
dries prematurely and stops the solvents evaporating from the rest of the
film.
 
C

Colin

Probably "trapped" solvents. If too much is applied in one coat, the
surface
dries prematurely and stops the solvents evaporating from the rest of the
film.
Nearly dry... I'll give it another few days...

Colin
 
N

N. Thornton

Colin said:
Nearly dry... I'll give it another few days...

Colin
just give it a week or 2, and use more suitable varnish next time.
 
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J

Jan Wysocki

I recently varnished a sign (indoors) with some international yacht varnish.
2 days later the varnish is still tacky. The pot says that the varnish
should be dry within 4 hours.
The wood is an old kitchen door (American Oak). I did not strip the original
coat of varnish, just sanded it down to provide a key.

Any ideas why the drying time is soo long?

I have noticed this problem in the past with other projects, where the first
coat always seems to take longer...

Any way of speeding up the drying?
Ultraviolet light will accelerate the 'drying' (really polmerisation) of
varnish. Sunlight is a free source of ultraviolet, but it's absorbed
by glass.
 
C

Colin

varnish. Sunlight is a free source of ultraviolet, but it's absorbed
by glass.
Not much chance of sunlight here over the next few days :)

Thanks for the tip.

Colin
 
R

Roland Mann

Rosie said:
I did this - painted a table with yacht varnish and it never dried. I was
told that proper yacht varnish doesn't dry properly, so that the deck of the
boat doesn't get slippy. I've no idea whether that was true. I ended up
stripping it and starting again with a proper interior varnish.

ROSIE
No, yacht varnish should always dry properly. The main reasons why
varnish doesn't dry are:

- Failing to stir it properly
- applying it too thick - varnish needs lots of thin layers and time
to dry in between
- applying it over an incompatible substrate - a previous coating that
it reacts to
- wrong temperature - too cold or too hot. Too hot sets the skin too
quickly and slows down evaporation of the solvent
- too much humidity (which sometimes causes a white bloom to appear)


Roland Mann
Jenny Painting Systems
 
P

P.R.Brady

Jan said:
Ultraviolet light will accelerate the 'drying' (really polmerisation) of
varnish. Sunlight is a free source of ultraviolet, but it's absorbed
by glass.
Don't want to depress you but we have some stairs with varnish which has
not dried fully and we've waited a year. Vim taking it back to bare
wood was the remedy. We found the tin in the shed with the lid off -
the surface of the varnish had not even skinned.
I suspect a bad batch or, more likely, the previous owner contaminated
the tin with cooking oil or something!
Phil
 
N

N. Thornton

Colin said:
Not much chance of sunlight here over the next few days :)

Thanks for the tip.

Colin
diffused skylight contains just as much UV. Glass windows block it though.

NT
 
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P

Pete C

diffused skylight contains just as much UV. Glass windows block it though.
I've never had much luck sunbathing under a parasol, let alone
sunbathing on a cloudy day :)))

cheers,
Pete.
 
N

N. Thornton

Pete C said:
I've never had much luck sunbathing under a parasol, let alone
sunbathing on a cloudy day :)))

cheers,
Pete.
uv photosensitive pcb works fine on cloudy days. NO suntan doesnt mean
no uv, just means not as much as in summer.


NT
 
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A

Andy Dingley

painted a table with yacht varnish and it never dried.
Spar varnish (the real stuff anyway, which most isn't) is intended to
remain flexible in service. It does "dry", but dry isn't especially
hard and it's much less than glossy.
 

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