3M 06502 Mahogany 5200 Marine Adhesive/Sealant - 1/10 Gallon

I've used 5200 for a number of applications, the most critical of which was for the installation of two large brass port hole windows on a house. This was in an area that is bordered by the ocean on one side and the bay on the other. The windows were mounted with 21 lag bolts and flashed/sealed with 5200. Created an absolutely water and wind proof seal as well as adding some additional structural strength. Yes, it's pricey but it's also necessary when dealing with critical installations.

In spite of the fact that the specs do not indicate its use for vinyl, I used this two years ago to apply a large patch/repair to my vinyl pool liner. The hole in the liner that was originally cut to accommodate the water supply/return from the pump had become significantly stretched to the point the original seals were not effective. I wanted to apply new material to both sides of the liner and I needed a bonding agent that was not a "fast setting". Using flexible, heavy gauge vinyl I cut and applied patches to both sides of the liner using generous amounts of 5200 on both sides. I allowed two days for the sealant to set before cutting a new hole through the patch. It worked perfectly and has continued to hold for two years.