I use the hudy balancer. It's expensive but well worth it. Every time I buy non hudy I end up selling it and buying hudy. The wheels spin forever and there are adapters for 1/8 and 1/10 so all my wheels can be balanced. The best stuff I have found for balancing is the gmk sticky stuff.
http://www.amainhobbies.com/product_...ancing-Station
http://www.amainhobbies.com/product_...alancing-Putty