So I have an unusual use for this product. I have a outdoor ground vault that houses an external pump for my pond. The PVC composite vault sits in a concrete footing. The bottom is just gravel and has a storm drain that exits to air 40 feet away. Any incidental ground or rain water that gets into the vault, will soak into the gravel and/or drain into the storm drain. But here in the Pacific Northwest we tend to get just a little bit of rain - for 8-9 months! So moisture in the vault is ever prevalent. Before using this product, when opening the vault lid, I would have moisture collecting on the underside of the lid (likely due to the heat produced from the pump would cause the vapor to condense on the colder surfaces. I placed the pale of this product on top of the primer pot. Viola! The vault remains dry! This is good as the body of the pump is steel. Further, it was noted that the last time I had a preventive maintenance on the pump, they noted the bearings had rust (likely due from when I would have the pump on a timer and it would turn off and cool down). This has checked the issues. I need to change the pale about once a season so all in all a great product!