How to Repair a Polyethylene Agricultural Sprayer Tank

Polyethylene spray tanks are prone to crack either from getting dropped or from freezing temperatures. This tank is one that.


Polyethylene spray tanks are prone to crack either from getting dropped or from freezing temperatures. This tank is one that mounts to the back of an ATV. The tank was dropped and developed a crack,
although the crack is difficult to see here. It also developed a crack that the owner tried
to repair unsuccessfully with an adhesive. This will be an easy repair. Clean the damaged area as well as you can
with Super Clean Plastic Cleaner. Use a rotary tool with a teardrop-shaped cutting
bit to create a v-groove and to grind away any crusty, oxidized plastic. When this tank was accidentally dropped, the
plastic got stretched and deformed from the impact. Soften the plastic with the hot air plastic welder and use something like a screwdriver handle
to push the plastic back into shape. The plastic on this tank was thinner than we expected, and we accidentally cut a hole
into the plastic with the rotary tool. It’s not a problem, though. Just use a wider strip of polyethylene to
bridge the gap. Make several passes with the strip
to not only bridge the gap, but also to make the plastic thicker and stronger. You may want to smooth out the weld and melt
down any curl to edges with an airless plastic welder. As soon as the plastic cools off, it will be ready for use. You can speed up the cooling with
compressed air if you want to. To repair the crack, clean the plastic then
remove a thin layer of oxidized, crusty plastic along the crack line with a rotary tool
and a teardrop shaped cutting bit. Lay down several passes of polyethylene welding
strip to repair the crack and get it extra strength. While the plastic is still hot, use an airless
plastic welder to melt down any curl to edges. After all the plastic cools off, test the tank for leaks.

10 thoughts on “How to Repair a Polyethylene Agricultural Sprayer Tank”

  1. I can't imagine anyone can sit through that idiotic beginning noise that some people I suppose call music without hitting back or pause button.

  2. Good Job & Good Idea For Plastic Ect' Weld.. I Think Beter Welding Surface Cleaning First.. Thank's.. S'g

  3. How would you recommend repairing stripped threads on a poly tank? The 1" hole is nearly smooth on the inside (threads are basically gone) and I'd like to install a spigot.

Leave a Reply

Your email address will not be published. Required fields are marked *