We use a stripper with "Aircraft" in the name. Got it from the local Carquest. We were buying it by the gallon, not cheap but very effective. Try not to get it into the seams of panels, it will attack the new paint as it leaches out in the future. Makes plastic soft and mushy, likely the same for fiberglass, although I haven't actually tested it on fiberglass. Gloves and respirator are a must.
When was the last time you bought it. As of 2019 the government stepped in and banned the use of a couple of chemicals in the stuff. The "ECO FRIENDLY" stuff on the shelves now just has no bite, it just don't work.
8-9 months ago would be the last time we got any for the shop. Methylene Chloride or Dichlonomethane (samething, just different name) is the active ingredient your looking for. And yes, the government is restricting the use of it for the average home owner DIY. "Professional use only" products can still be had, but you have to source them at commercial stores. Canadian Tire, Lowes, Home Depot, Home Hardware are all homeowner based retailers and don't or can't sell the potent stuff. Mainly because the homeowner won't protect themselves and others around them and cause big problems.
Thanks for the reply. I have been stripping cars with the stuff for years. Maximum two coats and your down to steel. The two body shop supply stores I have dealt with for years don't have it anymore?
