Milk Crate Welding

I decided to modify one of my beloved Ocean Kayak Scupper Pro TWs into a dedicated fishing yak.  One of the problems that kayaks that were not originally designed as fishing yaks is that standard milk crates will not fit in the tank wells.  I decided to get adventurous and cut a 1 and 5/8 inch slice out of a crate and plastic welded it back together.  This was great practice welding before actually trying it on my kayak.  I just used a heat gun, putty knife, and the scrap from the crate for filler.

Lessons learned:  No flame needed, heat gun melts material easily.
                          Molten plastic is 1000 times hotter than you think.
                          Take your time.
                          Milk crates are great to practice on.

Finished product is sturdy and fits perfectly.

Good work
Even lined up the pattern

I was just looking up adhesives for (notoriously difficult) HDPE plastic.  Seems TAP Plastic has a good polyethylene weld adhesive.  I'd like to play with it some...anyone have experience?

HDPE is very impervious to glues and adhesives in my experience with pipe.  Heat welding is the solution.