️ 10 Best Caulks for Showers and Bathtubs in 2021- the best caulk gun ,When you get ready to put a best caulking for shower around your tub or shower it is best for you to purchase an item that is 100% waterproof and that is mold and mildew resistant. You will need to purchase a caulking gun that the tube of caulk fits into so that you can apply these substances.11 Best Dripless Caulking Gun Reviews of 2021 | The Tooly9/6/2021· 2. Makita XGC01Z: Best Dripless Caulk Gun. This buying guide would have been an incomplete one if we did not include the Makita 18V Caulking gun as our best pick. If you are a professional and doing a lot of caulking work, this is the best caulking gun for you.