There are other similar items. “Edge trim” or “edge guard” is the item to be searching for. If anyone has a specific recommendation for trim in white – please post.
I use old floor mats from a car. I also never let tank set on the ground very long. All my cans are stored inside on a raised platform and covered with an old rug. Condensation from weather change will mess your gas can up inside real quick.
Boat places used to sell the white edge trim stuff for putting around tank bottom seams. I have used it but think it may trap water and contribute to deterioration of the tank.
I use a rubber door mat about 1/2″ thick found at local discount store. Same approach as F.Robb. Works well to protect the boat and the tank. Simple and good.
I have used use small rubber-backed rugs with a low pile so easy to keep clean. These are often advertised as rugs that will not slip on a smooth floor. I cut them down to a couple inches larger than the tank on all sides.
Dave