What's the best bead size to use on brick to trim

Thank you for your question. The depth of the sealant joint should be one-half the width of the joint and should be applied so the sealant has adequate, even contact with both sides of the joint. OSI QUAD Sealant is a solvent-based product and therefore, the product does shrink during cure. The recommended bead size is typically 3/8” and the minimum joint size is ¼”, but without knowing the specific details of your joint we can't recommend a specific bead size. You may visit www.ositough.com and review the product technical data sheet if you need more information on OSI QUAD Sealant.