- Features + Benefits
Uses + Applications
100% Waterproof window, door, & trim sealant. Ideal for composite wood and PVC trimboard.
Flexible enough to endure expansion and contraction without cracking or losing its seal.
Creates a 100% waterproof and weatherproof seal.
Trim and Baseboards
Seals joints up to 2" wide and has 50% total joint movement.
Durable and versatile formula backed by a Lifetime Guarantee.
Dynaflex 230 Products
DYNAFLEX 230® Premium Elastomeric Sealant
Silicone Tough latex sealant that offers outstanding exterior performance against the elements.VIEW PRODUCT
Prep the surface
Proper surface preparation is key. Remove any old caulk from the seam or joint by cutting or scraping it away. Clean the area with soap and water to remove dirt, dust, grease or debris, and rinse thoroughly. Make sure the area to be sealed is clean and dry to ensure good adhesion.
Secret to straight lines
Apply painter’s masking tape to either side of the joint before applying the sealant. Remove the tape before the sealant skins over – about 2-5 minutes. To remove, lift the edge up at a 45° angle and pull away from you.
Get a professional looking finish
To get a professional-looking finish after the sealant has been applied, smooth the bead of sealant with a caulk finishing tool dipped in water. Do this before the sealant starts to skin over, about 2-5 minutes.
How to choose the right caulk
Are you not sure what caulk or sealant is right for your project? With so many choices, it can be confusing.Learn More
Lower Your Energy Bills by Weatherizing Your Home
Properly sealing windows and doors not only prevents unwanted drafts, but also protects against damage from the elements.Learn More
How to Fix Drafty Windows
Keep currents of cool air in check with these indoor and outdoor solutions.Learn More
How to Caulk Like the Pros
Hone your caulking skills with these 8 tips for indoor and outdoor projects.Learn More
How to Seal and Insulate a Window and Door
Prevent air leaks and help your home be more energy efficient and comfortable with this step-by-step project.Learn More
Choosing the Right Caulk or Sealant
Use this guide to help you find the right caulk or sealant for the most common home projects.Learn More