take the boat to a ski repair shop. HDPE requires an 'artist' to weld
the cracks, etc. with similar HDPE 'welding rod'. A local 'plastics
welder' can also do the same. Most other 'repairs' will soon fail.

You can buy an inexpensive repair kit and"welding gun" kinda like a
soldering gun at any tool outlet like Northern Tools and do it yourself.Make
sure you use the correct welding rod(polypropolene).
I have the same boat you found and they are great boats! Put an electric
trolling motor or up to a 5hp gas outboard. On the electric use 2 batteries...1
to go and 1 to come back.Hard wire the batteries to a 1-2 or both perko
switch.Do NOT use the alligator clips.

HAVE FUN!
Larry Hill