I have a 36" x 60" pre-formed fiberglass/acrylic showerpan in white color. I have had an issue come up that I thought would not be so big of deal but now I can see it is. 3 of the sides of the pan have that lip that your tile/tile board can overlap. However the entire 60" front of the pan has no lip there! This is typical if you have the whole front open to a shower curtain or maybe glass but I only have 30" open and 30" is going to have a wall infront of the shower pan. I know that I can install tile and use silicone to seal that lip and then maybe grout down to the base itself to provide durability to the silicone behind it, BUT, I am worried for the long term life of the seal. Surely there is a better way?
The only two ideas I can come up with are 1.) A rubber gasket that will make a seal between tile and shower base lip, rubber meaning it's durable, will not rot, somewhat decent looking, etc. 2.) Some kind of acrylic mix that I can "form" a permanent lip for my tile to lay over. If this product exists please link it from an online source! Locally I can not find it. I was picturing something like bondo, but I do not believe bondo works with high moisture long-term.