Make sure you clean all of the wax off the tank first though with a quality wax and grease remover and scuff the paint with a scotchbrite pad. Make sure the clearcoat you are using isn't a lacquer- it will lift the enamel if it is. If it was me I would pull the tank off, drain the gas, and take it to a body shop. They should be able to do it for 75-100 dollars, which is a lot cheaper that If you mess up the paint and then have to have to have it repainted.