I do not want to drift off point with what Mike was trying to find out with his post , but Ty is right about the Silkspan of years ago, it is not being made anymore. I tried some of the stuff that Brodak had and it is not even close to what was made years ago. I went on a mission trying to find soneone who still made the good stuff but finally gave up and went to Polyspan. It took me a while but now I actually prefer Polyspan over the old good Silkspan. I remember asking Charlie Reeves how to apply it and dope it and after that, I never looked back.
Mike