Omnigrip

Anyone have an opinion on Omnigrip for 6 inch shower tile? Thanks, Don

No. Need Mortar not mastic.

see
http://www.custombuildingproducts.com/ProductCatalog and
http://www.custombuildingproducts.com/ProductCatalog/SettingMaterials/
for other choices of "setting materials" that have portland cement in them, from the same manufacturer. They are called mortar and not tile adhesive.

Since it's a shower, you'll never be happy with an adhesive.

You need a compound that gets mixed and then starts to set up (cure, harden, dry, etc).

Why? Because the mixing is the trigger for an irreversible hardening process. You won't get that with anything premixed in a bucket, so your shower water (moisture, humidity, etc) will cause the reversible hardening to reverse itself and you'll end up with spongey gooey glop under your tiles.

You need a setting bed whose main component is either portland cement -- or epoxy, since epoxy (usually sold as a high-end grout) also hardens (exothermically, by releasing heat energy) and nevers gets soft again.

Even some portland cement mixes harden very slowly, since they need oxygen to harden, and there are very few air molecules between a waterproof shower membrane and a tile. Epoxy hardens without air.

please call the manufacturer, Custom custombuildingproducts.com, and ask them too.

david