BobV Posted May 12, 2019 Report Share Posted May 12, 2019 I just coated the 9 oz fabric with Zar ultra exterior oil-based polyurethane and discovered that the two are not compatible. I'm guessing that the material expanded by 5% or so, lots of wrinkles. I should have tested it but used Zar many times on the 8 oz material with no problems. I'd like to use a polyurethane rather than a paint. What other brands of oil-based polyurethane have been used on the 9 oz fabric? I like the 9 oz material, no pull holes in sewing it up. I used the same method as with the 8 oz material that I learned from watching Jeff's videos, which are great by the way. It shrank as good as the 8 oz, and will appear to not need as many coats to fill the weave to a smooth finish. Quote Link to comment Share on other sites More sharing options...
Kudzu Posted May 13, 2019 Report Share Posted May 13, 2019 Recently had someone that used Coelan and had the same thing happen so I added a warning to that page. But the good news is a week latter they tried heating it and it shrunk back to size and pulled tight. Haven't hear any more so I assume it stayed tight. You might want to try it as you have nothing to loose. But as you said, you should ALWAYS test a finish on scrap first. Quote Link to comment Share on other sites More sharing options...
BobV Posted May 13, 2019 Author Report Share Posted May 13, 2019 I didn't wait a week to apply some heat. It did shrink but didn't last long. Do you know of any other polyurethane that will work? Quote Link to comment Share on other sites More sharing options...
Kudzu Posted May 14, 2019 Report Share Posted May 14, 2019 Have not tried poly on it so no idea. Quote Link to comment Share on other sites More sharing options...
BobV Posted May 21, 2019 Author Report Share Posted May 21, 2019 I've tested four coatings that I had in my paint cabinet from various projects. Ace polyurethane, Minwax polyurethane, Minwax spar urethane (which I think is another term for polyurethane), and Man O' War marine spar varnish. All the coatings worked with the 9 oz material. I'm going to go with the Man O' War varnish, my paint store mentioned that the spar varnish will be more flexible than a interior/exterior polyurethane. So it could be that Zar and Coelan are maybe the only two coatings not compatible with the 9 oz material. 1 Quote Link to comment Share on other sites More sharing options...
HBREW Posted October 28, 2019 Report Share Posted October 28, 2019 Haven't been on the post for a while but am getting ready to build another sof so I thought I would catch up. I built a shad last year shortly after the 9 oz came out and skinned with it. It did sew on very nicely. The few wrinkles ironed out nicely. I applied Varathane oil based sparurthane by Rust-Oleum. I experienced similar results with this product as with the Zar, more so where i has used heat to shrink the fabric, but some on the non-heated fabric. Reheating the fabric did not give lasting results. Anyone experiencing issues with oil based porch paints? Have not seen any mention of that. Quote Link to comment Share on other sites More sharing options...
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