It isn't fiberglass.
Just remember, the boat is plastic, not fiberglass. Make sure that you choose a cleaner that will not harm the plastic. Look at other posts here on the 90, 140 or 170. Here is what Dave Condon said in an earlier post:+=+=+=+=+=+=+=+=+=+buffing Submitted by Dave Condon on 06/07/2000 at 04:55am regarding Hunter 170Never use acetone or it will melt the boat. Suggest a fine type compound for example the liquid Finese-It by 3-M and a buffer. Make sure speed of buffer is low speed or you will burn the plastic. Crazy Dave