Our community club house is having the tables recovered. The Mechanic wants to use Bondo to seam the slates. My question is how does Bondo adhere to a slate that has been recovered about 3-4 times in the past 9 years. There is most likely a fair amount of wax on the seams. Is Bondo for a new (clean) installation only or can it be used on a surface that has a waxed presence. Thanks.