Tiling a Shower thinset question
Showers can be difficult to do correctly, even for some who consider themselves handymen who build dozens of them. More later.
Prolonged, would be a project such as a fountain or a pool. A shower does not quality as prolonged, but I would not use those products for the shower floor anyway. If not build perfectly a shower floor can stay wet for a long time which might cause a failure.
I assume you meant you bought Ultraflex 1 & 2. These products meet A118.11 which is a high standard in general. These products will bond well to EGP, exterior grade plywood underlayment. Ultraflex 3 is a better product and will work for prolonged wet areas, but a Big Box is not gonna carry the higher quality products. Does your Lowes carry Ultrabond? When mixed with their latex additive it would be a very good choice. What other brands and specific products can you find near you? Where are you anyway?
Back to building a waterproof shower. Do you wanna go over the steps you've taken so far? What are you doing for waterproofing?
Tile 4 You LLC Troy, MI
KERDI Shower Specialist ... DITRA Installs ... Product-Method suitability consultation. I have NEVER made a mistake, I thought I did once...........but I was wrong! - PRODUCTS ADVERTISED WITHIN MY POST ARE NOT ENDORSED BY ME!