Probably Tamiya's 1/12 scale Kawasaki 500 GP bike - didn't like the way the paint went on so I dipped the fairing, seat and tank into "enamel thinner" to soften the paint so I could scrub it off.
Well, it softened the paint just fine, along with the plastic bits, too. Ended up with a very droopy bunch of plastic.
Also, Italeri 1/24 scale Ferarri 250GT California - chassis and interior went together like a dream and looks fantastic (even to this day) but the body got a beautiful shade of red enamel, I put it into a warm oven to "bake" the paint a little.
Ended up being a touch too hot in that damn oven. I only switched it on for about 30 seconds.
The body ended up in a puddle on the baking tray.
The paint came up beautifully, though.....................
Cheers
LeeTree