It will eat through the paint if left on long enough. I had a car with damage from the previous owner. Zaino should protect well, and washing regularly should take the Sap off (esp. with Zaino) Try not to let it sit too long. Small spots can be cleaned with a QD or Bug n Tar remover. As long as it is not baking in the sun (Fall is nearly here) and you wash once a week I think you'll be ok.