I have hear of people having problems with dyna-beads. Them getting into the air stem valve and causing leaks. The best way to handle that is before checking your air pressure in the tire, take your air line and just a short blast of air into the tire will clear any beads that might be in the valve stem. I have done this for 8 years of running Dyna-beads and have never had a problem with them causing a valve stem air leak.
The other problem I have heard of is installing the beads. The problem is when you let air out of the tire rapidly it creates moisture right at the stem and when pouring in the beads they get caught in the moisture creating a blockage. The simple solution is the let the air out slowly over a period of time so the moisture doesn't build up. Then with the applicator bottle just pouring slowly the beads flow in without jamming up in the valve stem. The beads are the best way to balance out a tire without spending an arm or a leg on the results. The beads balance the tire continuously for the life of the tire. Compensating for all the wear of the tire. Something clamp on weights cannot do.