I think thats diflourathane, the one I found at radio shack was like fellows (tetra) and it came in a small can. The source sells they're 12oz duster for 15.50$ + tax. I sell 16oz cans for 18.50!
Your best way is going to the actual store and taking a look at it for yourself. Read the back label it should say if it's di or tetra.