When caulking have a small paint brush in a cup of water handy. After applying the caulk you can smooth it out with the wet paint brush Makes for a professional looking caulking job. Don’t try using your finger or a wet paper towel. Also works when patching holes in walls. Use a larger wet brush to smooth out the patch. Results in less sanding of the patch. You can use this tip for indoor and outdoor caulking and repairs.