No announcement yet.

mixing poly brands

  • Filter
  • Time
  • Show
Clear All
new posts

  • mixing poly brands

    here's an oh no tip. I was finish spraying a picture with poly. I had enough to finish one coat. I let it dry and sanded as per usual. Then I grabbed a different brand can and sprayed coat #2. Bad idea, the finish curdled the first coat. The other brand, which is actually a better brand, is not drying properly either. Now I have to wait for it to fully dry, which could take a week, who knows, and then I have to remove all the finish and start over. You may ask why not just sand it down now, but with the finish not being hard, it comes off like rubber, clogging the paper and making a bigger mess.
    Jeff Powell

  • #2
    Jeff, I had the same thing happen to me a few years ago, after letting the first coat dry, I used a different brand for the second coat and it turned white ( no it wasn't white paint )
    I ended up throwing it in the trash.

    Delta P-20 & Q-3

    I wondered why the baseball was getting bigger. Then it hit me!


    • #3
      Mixing finishes

      Thanks for that tip!


      • #4
        I sure won't trash it, I'll fix it. I'm hoping to do an article on this picture. I know if I'm patient and let it dry completely hard that I can sand out the orange peel. I'd love to show you the picture, but that might not be a good idea at this time.
        Jeff Powell


        • #5
          Jeff, if I can recommend something. Include the mistake in the article and show how you fixed it. I, for one, really like to see what others have done wrong and how they fixed it. Just an idea, of course.
          Chuck D

          When a work lifts your spirits and inspires bold and noble thoughts in you, do not look for any other standard to judge by: the work is good, the product of a master craftsman.
          Jean De La Bruyere...

          Hegner 18, Delta p-20, Griz 14 inch Band saw


          • #6
            Start to finish samples.


            A bit of advise to save you a lot of grieve down the road. Always, save a sample of the same wood you will be using on your projects to make up a complete start to finsh sample, this is also a great way to learn how to finish.

            in your case, you may have screwed up your sample, but not your scrolled piece, as the second poly coating would have showed you there was poor compartibilty between the two polyurethanes that you applied. And, you would have stopped.

            I hope you learned your lesson, and always use the same materials throughout your project unless you know better, and use the start to finish sample to be sure you have compatible materials throughout the finish. Samples, also allows you to learn new materials and techinques in the finish, and it can teach you how to make changes and improvments in they shouls be needed.

            Most woodworkers learn from our mistakes, while others learn from advise from others, who have already been there..

            Think Twice, And Finish Once


            Unconfigured Ad Widget


            Latest Topics


            • will8989
              Reply to Shrink wrap systems
              by will8989
              None Linda. You need to find the right heat temp so it shrinks but doesn’t put a hole in the wrap but the tape doesn’t shrink or tear.
              Today, 12:20 AM
            • Linda In Phoenix
              Reply to Shrink wrap systems
              by Linda In Phoenix
              What thickness of film seems to work the best for puzzles?
              The bags seem easier on the surface.
              But the film seems like it is more versatile on size variations.
              Yesterday, 03:24 PM
            • will8989
              Reply to Bruce, the one on probation
              by will8989
              Regulations are 150 square feet, this will be 144 square feet so we are good. He’s making it that size Since the sheets are 4’ wide. And the Shelves need to be 4” above my head!! It will be very specific.
              Yesterday, 10:32 AM
            • Sandy Oaks
              Reply to Shrink wrap systems
              by Sandy Oaks
              As a framer, we have a shrinker wrapper at ArtCrafters. Very simple. Film on a roller, sealer attached, just roll off enough film, seal the film, insert object, seal other end and shrink with a heat gum. We also use Uline as a source. Not sure where our unit can from as it was with the shop when...
              Yesterday, 09:46 AM
            • NC Scroller
              Reply to Bruce, the one on probation
              by NC Scroller
              I would make the shed 1" less than the size permits are required for. THERE IS NO SUCH THING AS TOO MUCH SPACE....
              Yesterday, 07:42 AM