pssherman
Member
I think I have discovered what is causing the silvery patches in my tube-in casts. I did an experiment where I coated the CA saturated braided sleeves and denim with different materials. I heated them in an oven and heated the PR before mixing (4 drops per ounce). I then left them in the pressure pot for about 16 hours. When I took them out some of the casts had the silvery patches and others developed the patches during the next few hours. The resin was still quite pliable and when I sqeezed the tubes (vertical casts) the silvery patches increased in size in some areas and decreased in size in others. This tells me that the patches are areas where the resin has pulled away from the cast tubes. I think I need to increase the cure rate and/or leave the molds in the pressure pot much longer so that the resin is not pliable when the pressure is released. Any comments or suggestions?
Note: My work area is 50 - 60 F so it is difficult to keep things warm. I use a paddle stick with a drill to do the mixing.
Note: My work area is 50 - 60 F so it is difficult to keep things warm. I use a paddle stick with a drill to do the mixing.