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Micro bubbles in SW Polane.

6/3/22       
John Furlan Member

I am sorry to bother you guys, I have posted like 3 times maybe.
Spraying Polane high gloss, following specs.

5 parts paint
1 part cat.
.25 part accelerator
.6 part reducer, MAK.

Tiny little pin point bubbles.

6/3/22       #3: Micro bubbles in SW Polane. ...
RichC

Temperature and humidity reading when sprayed?

6/3/22       #4: Micro bubbles in SW Polane. ...
John Furlan Member

75 in booth. Humidity not recorded.

6/5/22       #6: Micro bubbles in SW Polane. ...
RichC

I should have asked about wood species. I've had issues with red oak and ash with air bubbles in the pores after the first coat. Temp is on your side at 75 degrees. Might try an experiment with a little retarder, but I don't have experience with that material.

6/5/22       #7: Micro bubbles in SW Polane. ...
John Furlan Member

I'm sorry I'll try to be more concise with my problem.
The specific product is Polane 8890 polyurethane enamel.
We are spraying it over Polane machine Tool Finish primer sealer CC-D3. It's a 2k epoxy primer.
The substrates we are coating have been MDF, wood (poplar), and steel, sand blasted.
Application of the topcoat is 2.9-5.8 mils. We are near the 5.8 scale.
Reducer is Methyl Amal Ketones. You can reduce up to 15% if low voc is not a concern.
Since the micro bubbles have occurred we went back to the max 10% recommended to no avail.
Tack free time is 3-4 hours WITH accelerator so it should have plenty of open time to off gas without trapping solvent.
But after a half an hour the bubbles begin.
2 concerns on my part are the booth may be forcing the finish to "skin over" too fast trapping off gassing.
OR- we have been cleaning our guns with lacquer thinner, not the recommended Butyl Acetate or MAK. I had been using MAK but ran low so switched to thinner.
Would residual thinner in the guns create this? We ordered the Butyl acetate cleaner and hope it will clear this up. But it IS boggling.

This could be buffed out I'm sure but my boss is VERY much against polishing, takes too much time, so instead we are losing days of work and material, getting bubbles, waiting for the paint to dry, sanding it off, trying again. He doesn't see the irony in any off this.
Thank you for any help.

6/7/22       #8: Micro bubbles in SW Polane. ...
Dan MInzner

I've had the same issue with other Polys.
üst so you know, THere is no way to buff out or fill the micro bubbles.You'll need to either strip or sand down through them.
I added the maximum amount retarder to the finish and used the slowest thinner I had and that seemed to do the trick.

6/19/22       #9: Micro bubbles in SW Polane. ...
masterblaster

spraying to heavy of a coat.


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