After comming back from the range on friday, I noticed that the orangey shellac finish that the norinco sks has was blistered and almost 'popped' or boiled in areas around the handguard. It seems to do this every time that I shoot it. When I go to the range I like to shoot a lot, last time it was about 360 rounds of czech surplus in about an hour and 45 minutes which makes the sks really hot to say the least. I'm looking for ideas to replace the finish on it, I've got some leftover walnut stain and plolyurethane finish left over from other proejcets, anyone know if those would keep well under a high heat situation such as this one?? The mystery chinese wood appears to be rather dark in color, that's as close as describing it is going to get.