I know this is a VERY old threat but I wanted to know what you know (knew) about this product being used on watersides. I have been in the waterslide restoration industry for 10 years and have never heard this. It's a small industry so I am wondering what info you have on this. Thank you.It is actually used to repair new fiberglass pools that were cracked during transit or installation and is a great option for resurfacing. Several waterparks are also using EcoFinish products on their fiberglass waterslides because it withstands the constant abuse much better.