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Hi Carl, thank you for your answer. Vaseline is a brand name turned generic (like kleenex) for petroleum jelly aka soft paraffin. It has nothing to do with vegetal oil. So I think it should work as a booster. The only problem might be its viscosity, although when you rub it on your fingers it kind of turns liquid.
Julian
Yup I'll try at some point. The Vaseline we get here comes in a tube and is more fluid.
Julian