Contamination is an ongoing problem with painting. Many products today contain silicone, which really will drive one nuts. If you used DOT3 brake fluid, it's hard to get it out of the pores of the metal or plastic (yes, they both have pores, microscopic, but there). Before stripping, clean the object carefully with a good cleaning agent, like a Citrus based one. Purple power is good, but can effect some plastics. Oil from you hands also can give you problems, so after sanding, clean again! After priming a very fine sanding pad to smooth out the primer--and then clean again (not with Purple clean, it will take off your primer! Use a gentler cleaning product--too many out there to suggest one!). After cleaning, do NOT touch the primer with your bare hands. I have a small block of wood with some masking tape wound around it to provide a "Springiness" that I put the boiler or tender body on (so it stays put on the wood block) and handle it with that. By holding it by the block you can paint from underneath (cab roof underside) and all around. If you want to get fancy, drill a hole in the bottom of the block and make a stand out of a small piece of plywood with a bolt or nail through it that you can set the block on with the nail/bolt going up the hole.
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