I need help it seems every time I try to refinish a vintage guitar after repairing all the cracks every thing looks good until I get about 6 coats of finish on it . The splits start to show up .I have tryed the supper glue in them and resanding putting more finish on then when i buff it up there they are looking at me again. What now dose any one have any ideas what I am doing worng???? Thanks for any help I can get Bill::::::::