As a DIYer, you already know that water leaves your sealant joints susceptible to damage.
This means you should never apply sealants in heavy fog, snowfall, or freezing rain since they wouldn’t adhere as well to wet surfaces.
If you want strong joints that will last, only apply the sealant when the substrate is dry, and weather conditions are moderate.
But what if the weather isn’t cooperating, or you just don’t have time to wait for a dry day?
Is there a sealant for wet surfaces, or are there any roof sealants that can be applied in the rain? Let’s have a look…
Caulking for Wet Surfaces
Unfortunately, there are not many types of sealants suitable for wet surfaces.
Most sealants are designed to provide a watertight seal when applied on dry surfaces, and they may not adhere properly when applied to wet surfaces.
However, there are a handful of sealants (from specific brands) that can be applied in damp conditions.
DAP Flexible is one high-performance, clear elastomeric sealant formulated to provide a long-lasting, flexible seal.
It’s an ideal sealant for various construction and repair projects, including sealing around windows and doors, sealing bathtubs and showers, and gutter repairs.
This sealant has excellent adhesion and will remain crystal clear and permanently flexible even on damp surfaces.
It also has excellent UV resistance and can be used indoors and outdoors. The cured sealant is mildew resistant and can even be painted 24 hours after application.
A few other brands of water-safe sealants are Aldoseal 399 and Lexel by Sashco.
These will stick to wet surfaces but also helps keep water out to a certain extent.
You can also look for synthetic rubber caulk; many types of this variety are safe to use on wet surfaces.
If you’re having trouble finding any of these brands or synthetic rubber caulking in general, try looking online or at your local hardware store for caulks that explicitly advertise being able to withstand application in wet conditions. Maybe you can find one.
Applying Caulk Sealant to Wet Surfaces
Although some caulks can be used in wet conditions, you should still take care while performing the job.
Before starting, please read the application tips to apply them correctly. If there’s any confusion, you can ask the experts at your local hardware store for extra tips when purchasing the caulk.
After getting the caulk sealant that can be applied in the rain, it’s essential to do the test on a small area before doing the entire job.
This will help you determine whether the sealant is sticking to the substrate and not washing away due to water.
Once you have tested the caulk, follow these steps…
- Clean and prep the area to make sure its free of dirt, debris, or other old caulk material
- While applying the sealant, use a caulking gun to ensure an even and smooth application without releasing too much pressure
- Try to go slow and apply the caulk consistently over the surface while removing excessive sealant from the surface with a damp cloth
- Finally, if it’s still raining, use a shield or a tarp to protect the sealant from getting washed away.
Problems You May Face with Caulking in Wet Conditions
Wet surfaces and caulk commonly lead to mold or mildew growth.
Remember that caulk is used for filling the cracks and gaps so that dirt, germs, bugs, water, etc., cannot pass through them.
However, if the caulking job prevents water from escaping on either side of the crack, mold or mildew will form quickly.
So, if your job requires sealing an area that gets a lot of snow or rainwater exposure, it would be best to use a temporary sealant such as sponges or rolled-up small towels that can be stuffed in cracks.
This will help avoid any further (and possibly bigger) problems down the line.
The bottom line
Applying caulk and sealant to dry surfaces will result in a better hold and longer-lasting product as opposed to caulking in wetter conditions.
But if the weather conditions aren’t appropriate and your caulking job can’t wait for long, follow the above steps and use the caulk designed for wet surfaces and rainy conditions I mentioned above.
With the right product, precautions, and some patience, you can still get the job done quickly and effectively.
Jack Luis is a semi-retired painter who loved painting his clients’ ideas on their walls.
He had worked as a painter for more than a decade to serve the customers in areas such as Charleston, Mount Pleasant, Beaufort, Georgetown, SC (South Carolina). Today in his free time, he likes to read and write about the newer techniques that are being implemented in his profession. You may read more about him here or get in touch with him here.
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