Latex caulk is used to keep the moisture out of wood joints. Over time the latex caulk will dry out and will need to be replaced. This means you need a method for removing the latex caulk from the wood to leave it clean so you can apply a new layer of this practical adhesive. It’s a simple job using tools that, in most instances, you probably already own. Ensure you leave the wood clean when you finish.
Step 1 - Clean
The very first thing to do is to clean the wood and the old caulk thoroughly. Use a good wood cleaner for this, making sure you do a thorough job. This is important since it will help you remove the old latex caulk more cleanly. Allow the wood to dry completely before you move on to the next step.
Step 2 - Use a Heat Gun
If you don’t own a heat gun, it’s worthwhile to buy a small one since they have many uses including the removal of old latex caulk. If you don’t want to buy one, you can rent or borrow one instead. Set the heat gun on low so the temperature is no higher than 300 degrees Fahrenheit.
You don’t need to hold the gun too close to the caulk since you don’t want to scorch or burn it. Move the heat gun across the entire surface of the latex caulk so that you soften and loosen it. Don’t let the heat focus on a single spot for too long. Stop when the caulk is loose and you can press and move it easily with your fingers.
Step 3 - Remove Caulk
With the caulk soft, you can begin to remove it using a single-edged razor blade (make sure you always push the blade away from yourself in order to avoid any possible injury). Alternatively, you can purchase a special caulk removal tool which is designed to penetrate corners and small spaces in order to remove all the caulk more easily.
As it cools, the caulk will stiffen again so you might need to use the heat gun once more in order to soften it and then remove the remaining latex caulk with the razor blade.
You will need to remove all the old latex caulk and this can be achieved by inspecting your work and making sure that you dig down into all the cracks and deep into the joints to pry it all out. Stop only when all the old latex caulk has been removed. Wipe it clean with an old rag.
Step 4 - Use Denatured Alcohol
Now that the old latex caulk is gone, you need to prepare the surface for new caulking. Put some denatured alcohol on a rag and clean the wood, making sure you remove any old caulk that might still be lying on the wood. The advantage of using denatured alcohol for this process is that it evaporates rather than soaks into the wood, meaning you don’t need to wait for the wood to dry before applying the new latex caulk.