Richard All-Purpose Mixing Paddle - 3/8" Hex Shaft symphony grout is still porous and

grout is still porous and benefits from sealing in a steam environment

Don't substitute a generic unmodified thin-set if you want to maintain the Schluter warranty

Roughen the surface by sanding or scarifying

plank and tile

Richard All-Purpose Mixing Paddle - 3/8" Hex Shaft symphony grout is still porous andThe Richard All Purpose Mixing Paddle quickly blends paint, joint compound, grout, adhesives and similar materials. Its low drag paddle design mixes thick materials using less power and torque, while the shape reaches into the corners of cans for a thorough, even mix. The 3 8" hex shaft chucks into a standard electric drill, and the paddle cleans up in seconds. Key features Low drag design mixes thick materials with less power and torque Quickly mixes