yeah, I spray up in the crevice, that way when the window is resting up in the crevice, there is silicone to dampen the rattle. I need to apply it about every 2-3 weeks. Only bad thing is that silicone is totally useless in cold tempatures. Read the can, but I think it is like below 40 or 50 F is does not stay flexible. Not a prob here in Hollywood, Ca.....but can suck for lots of other folks in cold states. Hope this helps, and good luck!!! I buy Krylon Silicone Spray...about $5.00 a can...and is great for all around the house.