welluck gray silicone caulk, 100% waterproof silicone sealant adhesive caulking,for rv, kitchen,bathroom, window, door, glass,10.2fl.oz/300ml?4 pack? 4 pack gray is up for auction in Tools & Home Improvement. The current bid is $1.50, 94% below the $24.90 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.