Fixing a leaking rainwater tank, particularly one made of plastic (polyethylene), typically involves repairing the crack or hole in the material itself. The most effective methods often involve melting the plastic or using a specialized adhesive designed for plastics.
Repairing a Leaking Plastic (Poly) Tank
Plastic rainwater tanks are common, and their repair requires methods that can effectively bond with or melt the poly material.
Method 1: Plastic Welding (Recommended for Poly Tanks)
According to experts, a plastic welder is the most appropriate way to repair a hole or crack in a poly tank. This method is highly effective because it works by fusing the plastic material together.
- How it works: Plastic welding involves using a special tool to heat the edges of the crack or hole and often a plastic filler rod of the same material. The heated plastic melts and flows together, creating a strong, seamless bond as it cools.
- Why it's preferred: The hole/crack needs to be melted back together as not many products will stick to plastic. Melting creates a bond that is structurally sound and less likely to fail compared to adhesives that struggle to adhere to the slick surface of polyethylene.
Method 2: Epoxy Putty (Alternative Adhesive Method)
While plastic welding is preferred due to the difficulty of adhesives sticking to plastic, certain specialized products can be used as an alternative, especially for smaller leaks or as a temporary fix.
One option is to try PC Products 57g PC Marine Epoxy Putty.
- Preparation is key: Before applying any adhesive product like epoxy putty, thorough preparation of the surface is crucial.
- Clean the area around the leak thoroughly with soapy water. This removes dirt, algae, and any other contaminants that could prevent the putty from sticking.
- Dry the area completely. Moisture will also prevent proper adhesion.
- Application: Follow the product instructions for mixing and applying the epoxy putty to the clean, dry crack or hole. Press it firmly into the gap to ensure it makes good contact with the tank material.
Keep in mind that not many products will stick to plastic, which is why plastic welding is generally considered the most durable repair method for poly tanks. Epoxy putty can work if properly applied to a well-prepared surface, but its long-term effectiveness on plastic can vary.
Summary of Plastic Tank Repair
| Repair Method | Description | Effectiveness on Plastic | Notes |
|---|---|---|---|
| Plastic Welding | Melting plastic edges/filler together. | Most Appropriate | Creates strong, fused bond. Needs specialized tools. |
| Epoxy Putty | Adhesive applied to clean, dry surface. | Moderate (can vary) | Requires thorough cleaning. Fewer products stick well. |
Choosing the right method depends on the size and location of the leak, as well as your comfort level with the repair technique. For a permanent and reliable fix on a plastic tank, plastic welding is the recommended approach.
