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 mounts to the back of an ATV. The tank was dropped and developed a crack. It also developed a crack that the owner tried to repair unsuccessfully with an adhesive. This will be an easy repair.

Most agricultural spray tanks (and those made for ATVs) are made from polyethylene. This is because nothing will react with polyethylene; it is very stable. Solvents don't affect it.

Polyethylene tanks have low surface energy so liquids (and adhesives) have a difficult time "wetting out" on the surface. Putting an adhesive on polyethylene is like putting water on a freshly waxed car. The adhesive wants to "bead up" on the surface. The only way to permanently repair the polyethylene chemical spray tanks is to weld the plastic as shown here.


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Chapters:
Intro: 0:00
The damage: 0:10
Cleaning (crack 1): 0:41
Grinding the plastic (crack 1): 0:51
Pushing the plastic back in place (crack 1): 1:04
Welding (crack 1): 1:18
Smoothing the weld (crack 1): 2:36
Grinding (crack 2): 3:05
Welding (crack 2): 3:19
Smoothing the weld (crack 2): 4:05
Final look: 4:30


⚠️ Important ⚠️
- Always wear proper safety gear while working!
- The length of this video is in no way representative of the actual time required to perform a complete repair and therefore should not be used for estimating purposes.


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