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rjordan393 02-06-2012 05:22 PM

Cure Time For Spar Urathane
Will spar urathane cure faster with pine wood at room temperature vs outdoor temperatures at 40 degrees F or lower?

Mr. Paint 02-06-2012 05:54 PM

Colder temperatures slow cure time, especially water-base coatings. you also run the risk of having moisture wrinkle the finish. If you are varnishing with an alkyd indoors, keep your work area ventilated and extinguish pilot lights, cigarettes, cigars, etc...

rjordan393 02-06-2012 05:59 PM

I built a hood for aquarium lights and its been two days since I urathane it and I can still smell some fumes while letting it cure outside.
I'll bring it indoors to speed things up.

jsheridan 02-06-2012 06:02 PM

I thought I just posted, but it's not here. I don't know whether I'm having a premature senior moment or it vaporized into cyber space, I'll go with the latter.
To restate
Yes, 40 degrees will retard dry/cure time, and it may even damage the finish. Mr. Paint just told you how.

Faron79 02-07-2012 11:56 PM

Another thing that comes into play here-

Oil Paints & Polys cure mainly by reacting/linking with O2-molecules.
The more fresh air is exchanged, the faster the cure...TO A POINT.
It can only go so fast....

Temp & humidity are important too!!!


rjordan393 02-08-2012 05:16 AM

I checked it this morning and it is still emitting fumes. I might have to wait up to 4 or more days for this to cure. The interior temperature is 68 degrees. This reminds me of the time when I urathaned a interior door just after purchasing a new gas range and the range started to emitt a differant type of fume.
A serviceman could not understand the problem. I called the gas company and when their serviceman smelled it; he asked if I did any painting. I pointed to the door and he said the new gas ranges burn more efficiently that these fumes are a byproduct and that it will cease when the door cures.
The house I live in now has an electric stove and it's not affected.
I'll also have to see what the differance is between "spar urathane and regular urathane" when it comes to cure time.

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