I have used this product from another supplier before with no problems. These tubes were damaged and expired. I had to use the product so I hoped for the best. A tube leaked past the piston and completely ruined my caulking gun and the only way to get the tube off the gun was to cut it open. It's a good product, but the seller needs to pack it better and rotate their inventory. If you buy from this supplier, check the expiry date and the condition of the tubes upon receipt. If it doesn't look good ask for a replacement so you don't have the mess I made.