Traditional mortar grout and acrylic joints can easily be painted over with EPODEX's TILE PAINT. You can use different size foam roller or even a brush depending on the size of your grout. If you use a brush to paint your grout, the paint must be rolled on afterwards!
Silicone joints on the other hands can't be painted over with tile paint. The paint doesn't stick well to silicone. It is important to remove silicone joints before painting and renew them with acrylic.