Not done it on a gas gas, but on a KTM 500 I used to have in a MX sidecar. About 5psi and a hot air gun / paint stripping gun is all you need. Clean tank out first tho.
Although on the gas gas the tank sits quite snug in the frame so not sure you'll get much this way, I'd limit any heat to the black part of the tank only to ensure the tank still fits in the frame.
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Gas Gas EC 300 '06
BMW F650
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