Rodney, 

assuming you are repairing a boat, the same MAS epoxy that is used in construction is also the best glue for repair.

it can be purchased in relatively small quantities when you are doing a repair....if you don't have any left over from construction. 

to the extent you can describe or take a picture of the 'repair' you are trying to make, we can provide additional advice.

all the best,

h