I have a Nashua NFP-1 circa 1978.I had planned on repainting it this year and have noticed cracking at multiple areas on the stove.At the front of the stove at the opening to the fire box it is cracking at each corner of the opening.At the sides where the hot air vent is for the blower there is a crack emering from the corner of the vent.And at the back plate where the blower motor mounts there is a crack.#1 Is this amount of cracking normal?#2 Is it worth having a mobile welding service repair the cracks.