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post #1 of 29 (permalink) Old 07-04-2016, 03:14 PM Thread Starter
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Default wipe on poly problems

I'm having really severe problems getting my wipe on poly to set smooth. I've done one box about 5 times now, sanding the old off and re coating.
I have had good success with this before so am wondering whats changed.
Do any of you know if poly varnish is affected by the temps when its applied?
We are now into full summer, daily temps of 37c (98f) in the shade, and probably mid 40's (110f)in the garage on the shelf where the tin is.
I cant find any temp range on the tin, but do you think this could be the problem?
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post #2 of 29 (permalink) Old 07-04-2016, 03:54 PM
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The temp may be your problem Bob. Many finishes like poly are designed to be self leveling but if it's too hot it will dry before that can happen. You might be better off using rattle can finish until it cools off some.
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post #3 of 29 (permalink) Old 07-04-2016, 04:57 PM
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Agree with Charles. I use wipe on poly but try to stay away from high temperatures and high humidity.

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post #4 of 29 (permalink) Old 07-04-2016, 05:43 PM
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I went outside and sprayed a poly clear coat from a rattle can and it frosted up. It kinda looked milky or maybe I should say cloudy. I know this isn't your problem but I think my problem was humidity because I went inside where it is air conditioned and it was okay.

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post #5 of 29 (permalink) Old 07-04-2016, 06:09 PM
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if poly works like lacquer, the cloudiness you are describing is called "blush", and yes...humidity is the cause. With lacquer, you can sometimes avoid this with lacquer retarder to slow down the drying so the water has a chance to evaporate before it gets trapped. Again, I don't know if this is the same with poly.


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post #6 of 29 (permalink) Old 07-04-2016, 11:23 PM Thread Starter
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Looks like I'm screwed.
Humidity is almost 80% today, so that lets out the spray can.

My one chance is to clean it all off and reapply it in our bedroom as thats the only room we have air con on during the day because we just live outside in the shade for the summer.

And to make it worse I'm on a deadline with this one.
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post #7 of 29 (permalink) Old 07-05-2016, 08:28 AM
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Great question. I'm going to be doing some of this, and the humidity problem is good to know about in advance. Looks like the bedroom is the only option since you're on a deadline.

It seems I never finish what I
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post #8 of 29 (permalink) Old 07-05-2016, 09:49 AM Thread Starter
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I'm now in a dilemma.
I've sprayed a piece of scrap from this box with acrilyc laquer. Its taken fine with no bloom.

But if I want to spray the box I have to remove absolutely all of the oil based poly. Thats a lot of work, and I might find I've missed a bit and the acrilyc ballooons it.

Decisions decisions.
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post #9 of 29 (permalink) Old 07-05-2016, 10:48 AM
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Try a test piece with wipe on poly in the AC bedroom. AC tends to reduce himidity. I do wipe on poly with folded paper towels instead of a brush, which technique I found on an instructional site by someone noted for his finishing work. Can't find that video but it sure does the trick.

The more I do, the less I accomplish.
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post #10 of 29 (permalink) Old 07-05-2016, 11:07 AM
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Quote:
Originally Posted by DesertRatTom View Post
Try a test piece with wipe on poly in the AC bedroom. AC tends to reduce himidity. I do wipe on poly with folded paper towels instead of a brush, which technique I found on an instructional site by someone noted for his finishing work. Can't find that video but it sure does the trick.
Tom, I believe that the AC tends to reduce the apparent humidity. If the air is cooler, it won't hold as much moisture. Think steam here.

At below zero temps, like -40 for example, the air won't hold any moisture.

The additional high heat that Bob is experiencing will also make the finish skin over very, very quickly. That will only compound the problem.

Perhaps trying to cool the lowest room in the house will help? Try doing the finish as close to the floor as possible.
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