After 2 years I finally glassed the inside and it turned out really bad. I could see some spots not staying down good but the more I tried to work them out the worst they got. I ended up with maybe a dozen nickel size spots that are raised up about 1/16 inch and another dozen small spots. All on the bottom. I have read here how to sand and patch but I was afraid with so many it would be very noticeable. I thought maybe I could sand out these spots and put another layer of glass on the whole bottom. Thoughts on this? BTW weight is not as big a concern as being right. It will be used on local lakes only. Thank you for any advise.