I have one particular drive to seal way that might be prone to having tree sap on it. And im wondering if there might be enough tree sap on it to affect the sealer from properly adhering to the surface. It is about as long as a foot ball field and there are trees lining one side of it and half way overhanging the drive. I would hate to eat the cost of resealing it if the sealer doesnt stick. Would there be any chemical that could be sprayed prior to sealing that would take care of this potential problem.