Comments on: Painting Boral TruExterior® Trim http://topcoatreview.com/2017/02/painting-boral/ Where Product Drives the Painting Process Wed, 21 Jun 2017 20:16:10 +0000 hourly 1 https://wordpress.org/?v=4.8 By: Brad http://topcoatreview.com/2017/02/painting-boral/#comment-170313 Fri, 19 May 2017 19:41:07 +0000 http://topcoatreview.com/?p=12454#comment-170313 I just did a little over 1100Lf with Benjamin Moore Arbor Coat. I used 7″ rollers with 3/8″ Nap. I did not have any of the issues with the bubbles.

This was using 5/4 x 6 and 1 x 4.

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By: Scott Burt http://topcoatreview.com/2017/02/painting-boral/#comment-168419 Sat, 11 Feb 2017 23:54:52 +0000 http://topcoatreview.com/?p=12454#comment-168419 Tommy, our theory is that the Boral is porous, but it was totally sealed by the factory applied primer. The sprayed application of BM to mfr speced mil thickness just hit the primer and sat. Whatever happens when atomized acyrlic hits and sits on sealed polymer fly ash…happened. Being air assisted with low pressure fine finish tips, it was odd. All we can say is that the bubbles were a function of the substrate, and theorize as to why, but in the exact same room and timeframe it didn’t happen on wood or pvc.

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By: Tommy Johnson http://topcoatreview.com/2017/02/painting-boral/#comment-168418 Sat, 11 Feb 2017 22:01:17 +0000 http://topcoatreview.com/?p=12454#comment-168418 So just to recap what is the diffinative cause of the bubbles? The primer absorbed water or some other contamination?

Haven’t used boral yet but know plenty who do. Main concern thus far is dust when cutting or milling.

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By: Scott Burt http://topcoatreview.com/2017/02/painting-boral/#comment-168415 Sat, 11 Feb 2017 11:44:27 +0000 http://topcoatreview.com/?p=12454#comment-168415 Hey Troy, thanks for stopping by. We didn’t do a moisture test, because composite products are pretty much impervious to it. We did do a quick mil thickness check, and we were within BM spec for RS. I do think multiple light coats would have minimized it, but it might have been so thin and light that we’d have ended up better off brushing or rolling. That is probably where I would start though. The trick is that the edges of this stuff are very porous and difficult to cover compared to the faces, so there is a difference there. Manual application might just be the best way.

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By: Troy Stevens http://topcoatreview.com/2017/02/painting-boral/#comment-168408 Sat, 11 Feb 2017 09:07:14 +0000 http://topcoatreview.com/?p=12454#comment-168408 Thanks for the heads-up Scott. Curious indeed. By pics alone, I would’ve guessed solvent entrapment. Although I think I understand your position is the antithesis, just for fun, did you do any moisture tests, and if so, what were the readings? Do you think the issue could’ve been minimized or even eliminated by applying multiple light coats, (substantially lighter than manufacturer’s specs) ?

What, (if anything), can we do to insure this doesn’t happen in the future? Just trying to wrap my head around it.

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