I live in Phila PA. After searching for 2 months with a budget of $500 for a quality classic looking stove for my 6" SS duravent chimney.- There is a clean 5 year old VC Resolute Acclaim (NON-CAT) for sale nearby for $500. It has 2 warming shelves, no screen. Seller tells me it has 'leaky joints' (it was running hot) but they had it checked by a pro and there is no warpage or cracks. Seller also says that the Combustion block is in just fair condition. Is $500 ok? What is the proper material/method to seal "leaking joints"? Thanks, Jeff C.