Control arms hold front wheels, allowing up and down movement. of the front suspension. The control arm is an important part of the front suspension. It connects the steering knuckle (the part that holds the front wheel) to the vehicle's frame or body, see the photo.
However, when grout is used in place of caulk, the grout can cause structural and aesthetic problems. 1  The grout will crack allowing moisture to penetrate. 2  Where the grout is sufficiently strong, movement in the walls, floor, or countertop can damage the tile.  Grout cannot hide corner cuts as well as caulk.
Short answer is no, you don't NEED to seal the grout. Grout sealer is one of those products that manufacturers try to sell people that really aren't the best idea in the world. The pitch is that it will prevent mold forming. Well, that is only true in the very short term.