Flexi Board is a Breakee Board?

I bought one of those 10’2 Boss Board pintails- used and I paid $600. It has a really original shape, super thin on the nose and tail and like a regular log in the midde. It had a couple of rail cracks that were sealed but it was excellant condition. It rode super fast and loose like a champ (however i didnt get so many nose rides) but after only a couple of days I noticed more rail cracks. THe last time I took it out in smally dumpy low tide hollow waves. I didn’t want a board that would be so brittle and crack so easily. Should I reapair the cracks and sell it for $500 and cut my loses or is there a chance this board can last me atleast 1 year (120 sessions).