I usually buy mine from Harbor Freight, because it tends to be cheaper than Amazon for small amounts. 0.3 oz tubes are $2 or the larger 3oz size is $8. If you d

I usually buy mine from Harbor Freight, because it tends to be cheaper than Amazon for small amounts. 0.3 oz tubes are $2 or the larger 3oz size is $8. If you don't use it frequently, don't buy the biggest size. Eventually, it will get crusty, but you should be good for months once it's opened. The key is to be prepared when using it. Wear nitrile gloves and squirt two equal size blobs next to each other. Mix thoroughly and quickly with a small, disposable stick like a matchstick or large nail. This can be used as the applicator as well. You want to mix on something non porous and disposable: I use aluminum foil for small amounts. Don't use plastic for the mixing container, as I've found it sets it faster. Don't mix more than you can use in a few minutes, because it will become unworkable quickly. Hold or clamp for 5-10 minutes. It will hold after that, but overnight for a full cure.