i recently purchased a 16 carolina skiff it ran fine first three times i put in .all with in a week . third time i put in stopped getting on plane at full throttle .thought prop might be bad so changed and still doesnt palne wide open .while checking motor for issues noticed to spots where there where cracks in the hull .one looks to be batched with gel the other with jb weld .will this cause leaks and extra weight in hull and if so how do you fix?