Riding doesn’t get the sealant into the sidewalls and bead area of the tire to any appreciable extent because of centripetal force, which forces the sealant into the tread area. That's why you should shake or spin the wheel around when it is in a horizontal position after you put the sealant in.
I use one of these plastic planter boxes filled with water to look for leaks in the tire, rim tape, valve... $8 at Lowes. Seal the holes in the box with duct tape.
