I recommend tyre warmers, but the Torch is part of racing that we cant and will never stop. If you insist on the torch method, warm the tyre and apply your prep. Most/all preps have a low flash point and you are not doing anything but burning the prep out. Keeping the tyre warm and applying prep till about dry then repeat process. I do not ever recommend torching a tyre that is wet. DANGER!!!!!!!
That's my 2 cents.
KB