Second Hand Surfboard

Hello guys!
I am new to this forum but I would greatly appreciate your opinion on this topic.
I am about to buy a second hand board. In this case it is a Channel Islands motorboat. Everything seems fine, it has minor dents and the owner told me they were all well fixed. The only thing that doest make me feel 100% comfortable is the color of the board. In some parts (specially on the back) there are brown spots. I am worried about them and would like to know what you guys think about the board.
Should I buy it?
I am new to this forum but I would greatly appreciate your opinion on this topic.
I am about to buy a second hand board. In this case it is a Channel Islands motorboat. Everything seems fine, it has minor dents and the owner told me they were all well fixed. The only thing that doest make me feel 100% comfortable is the color of the board. In some parts (specially on the back) there are brown spots. I am worried about them and would like to know what you guys think about the board.
Should I buy it?