I have read and saved the tech sheets for Polaroid P/N 55. I am shooting 4x5 sheets in an Aletta that erie was kind enough to forward to me in lieu of further remuneration. I just received my first lens (140mm ernemann doppel f/11) from eBay before the weekend. Wanna get some things straight before I proceed. 1. Tech sheet states that the print most be coated in acrylics. I did not get the tubes of acrylic with the film as it was slightly outdated (I am financially challenged). Can I just spray some Krylon acrylic clear over the print sparingly? I honestly am not so concerned about the prints as the negs but I don't want to simply discard them either. 2. Tech sheet states to treat the negative in sodium sulfite before clearing. Is there a simple place to get something that will do the same thing that won't set me back too much? What else have you all used? 3. Tech sheet states not to use commercial fixers as they might damage the emulsion. I have Kodafix. Will that honestly suffice? Once I iron these details out, it's off to LF photography for me. WOOHOO!!!!!!!