heck all it needs is a little bondo use a little extra hardener then just smooth it out and its good as new and strong too ! most new cars have it in them from the factory ! another great product is alumi/lead its a powdered metal based product it uses fiberglass hardener to activate ,you can drill and tap the stuff the white based product can be used to repair bridge work, it still will pop loose when crunching ice <darn it>have not found anything to hold up to ice ! and yes we have tried dental porcelain several times .the product used to spot repair cannot be heated up to a high enough temperature to get it hard enough to bond and cure enough to handle ice !< have tried several blends ect > anyone else had any good luck ?