Tip for beginners - Scroll Saw Woodworking & Crafts Message Board

texaswoodworker · 10-15-2009, 05:35 AM

Here's a tip for anyone who is not experienced with polyurethane. I have always been told that polyurethane will turn a white like color if it is used when their is a lot of moisture in the air (Right before, during, or after rainfall and high humidity). I'm not sure if the type of wood is a factor in this but better safe then sorry.

Hope this saves some people from a lot of extra work and headaches.

oily · 10-15-2009, 08:57 PM

Quote:

Originally Posted by texaswoodworker

Here's a tip for anyone who is not experienced with polyurethane. I have always been told that polyurethane will turn a white like color if it is used when their is a lot of moisture in the air (Right before, during, or after rainfall and high humidity). I'm not sure if the type of wood is a factor in this but better safe then sorry.

Hope this saves some people from a lot of extra work and headaches.

I haven't had this problem. Thanks for the heads up, I'll watch for it in the future.

I hate gettin' eddykated. Now everything I do will quit workin'!

sawdustus · 10-16-2009, 01:03 PM

Polyurethane will turn yellow if applied over white or light colored water based paint. It is shellac that will turn white or cloudy if applied during wet or very humid weather especially if it is also hot. Been there done that for both.

george

texaswoodworker · 10-16-2009, 01:50 PM

Thanks for the correction.

marshall · 10-16-2009, 02:09 PM

Quote:

Originally Posted by sawdustus

Polyurethane will turn yellow if applied over white or light colored water based paint. It is shellac that will turn white or cloudy if applied during wet or very humid weather especially if it is also hot. Been there done that for both.

george

You know that I use only poly on my Walnut Oranments and I've had a few that had turned cloudy or a white haze a few times and I fiqured that it was the Humidity problem...........Marshall

texaswoodworker · 10-16-2009, 03:52 PM

I guess both can do it. Thats bad for me because we are having record amounts of rain this year in Lamar County.

bmc3b7 · 11-04-2009, 08:47 PM

I had the same problem with polyurethane. I refinished two oak end tables, about two weeks apart. The first one came out beautifully, but the second one has kind of a milky white glaze look to it. I did all the steps the same, so my only conclusion was that the temperature/humidity level was different for the second end table.

10-15-2009, 05:35 AM	#1
texaswoodworker Member Join Date: Apr 2009 Location: Reno Texas Posts: 254	Tip for beginners Here's a tip for anyone who is not experienced with polyurethane. I have always been told that polyurethane will turn a white like color if it is used when their is a lot of moisture in the air (Right before, during, or after rainfall and high humidity). I'm not sure if the type of wood is a factor in this but better safe then sorry. Hope this saves some people from a lot of extra work and headaches. __________________ Aaron

10-16-2009, 01:03 PM	#3
sawdustus Senior Member Join Date: Jun 2006 Location: New Jersey Posts: 1,975	Polyurethane will turn yellow if applied over white or light colored water based paint. It is shellac that will turn white or cloudy if applied during wet or very humid weather especially if it is also hot. Been there done that for both. george __________________ A day without sawdust is a day without sunshine. George delta 650, hawk G426

10-16-2009, 01:50 PM	#4
texaswoodworker Member Join Date: Apr 2009 Location: Reno Texas Posts: 254	Thanks for the correction. __________________ Aaron

10-16-2009, 03:52 PM	#6
texaswoodworker Member Join Date: Apr 2009 Location: Reno Texas Posts: 254	I guess both can do it. Thats bad for me because we are having record amounts of rain this year in Lamar County. __________________ Aaron

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11-04-2009, 08:47 PM	#7
bmc3b7 Junior Member Join Date: Oct 2009 Posts: 3	I had the same problem with polyurethane. I refinished two oak end tables, about two weeks apart. The first one came out beautifully, but the second one has kind of a milky white glaze look to it. I did all the steps the same, so my only conclusion was that the temperature/humidity level was different for the second end table.