[hugger6933]

The answer to this is probably gonna depend on the filler type[IE long hair glass VS. short strand chopped glass VS.plastic filler]. It also will depend on the type say Rage Gold by Evercoat may stand a little deeper wipe of filler than say a parts store Bondo brand knock off. If it is a reputable brand[like Evercoat 3M or Dynalite and so on] they should say on their website product info and you may find it there. I can tell you 1/4 inch is not real thick and filler has been used for a lot thicker applications than that. If you are needing to wipe much more than 1/4 inch of filler I would really suggest more metal work by either studs welded to the panel then pulled with a lever tool or slide hammer or by welding metal tabs or straps welded in the deepest part of the damage then pull with a come-a-long