Just posting this to archive and save someone struggling some time.
http://tbbonding.com/
After searching for and researching what to do with a cracked tank I found these guys. Called them explained to them walked me through what to buy and it worked amazing.
I welded mine first with hdpe filler rod from grainger to make the materials match. Then patched it with their poly patch make sure you follow the instructions, if the tank is cracked drill the ends!