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BobV

9 oz fabric and Zar

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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. 

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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.

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