SL/R230: What is the adhesive used for panels

(representative pic)
Prime it first with cyanoacrylate (any type - like Crazy Glue or Loctite Super Bonder 409) then the epoxy will stick to that.
If there's a layer of glue on the plastic then try ordinary construction adhesive (Liquid Nails or similar). Or Gorilla Glue original, but the trick is to prime the ABS with cyano. Because of its oily, waxy feel cyano is the only thing that will really bond to it without peeling off.










