Can I use epoxy to put in a couple of tiles? [View all]

I need to put two tiles at my sink, and two or three on the window sill above the sink. At the sink the underlying material is the ceramic sink material and a strip of the cement board used for tile. On the window sill the underlying material is drywall.

The job is too small for any of the tile people I have contacted. Well, I did have one guy that was going to do it but he has not returned calls for a month and now his phone is disconnected. He had done a slightly larger project and I had planned for both to be done at the same time, but that did not work out. He promised to come back to do this part but now I have no way to locate him.

I know the small containers of pre-mixed tile adhesive are not appropriate for a wet or damp location. I also know that epoxy grout is sold, but not in the very small amount I need. So I am wondering if I can just use epoxy adhesive to glue the tile down. I figure epoxy is water proof (or at least resistant) and should hold up to being at the sink.

I'm looking at PC Products PC-11 Paste Epoxy - it can be used to reattach tile on swimming pools as well as repairs in a marine environment. https://www.pcepoxy.com/products/permanent-repair/pc-11-paste-epoxy/

One advantage is that it comes in smaller sizes than tile adhesive materials do, as small as 1/2 pound or even smaller. I'd need about one pound to do both projects.