Hi guys.
In the UK modellers commonly drill a few holes in an inconspicuos area underneat to allow adhesive and glue fumes to escape. For weights that might not glue extremely easily to the interior of cars I enclose them in a box (note enclose not seal) of a material that will glue easily to the inside of the car. I then drill vent holes as well. I frequently use English 2p coins as weights as they are a definite weight and cost less than wheel balance weights and a Line weights. Cents might be too light and quarters to expensive in the USA.
Could Denny Anspach contact me offline please. his link doesn't seem to work on my computer.
Regards Philip Dove