Hello Bill,
Others wanted and have tried different methods to quiet down the springer air rifle, but even ifyou use to much heavy tar, you will loose velocity in your springer.
Others have tried Plasti Dip and Plastic Coat to quiet down their springs, but with the loss in velocity, all that I have heard of, went back to a light coating of heavy tar. even using too much heavy tar will slow down your springer !
Good luck !
Bill