Protecting your RV exterior from the elements is crucial for maintaining its longevity and comfort and you might need to the best sealant or caulk for small fixes.
One of the most important aspects of this protection is using the right sealant for your RV’s exterior. If you need to make some fixes to your home on wheels, you want to get it right.
Having made plenty of fixes to our vans down the years, here our verdict on choosing an RV sealant that lasts and protects for the years ahead.
Overview of RV Sealants
RV sealants are specially designed adhesives that fill gaps, cracks, and seams in your RV’s exterior.
Unlike standard silicone caulk, RV sealants are formulated to withstand the unique challenges faced by recreational vehicles, including extreme weather conditions, UV exposure, and constant movement.
That is why it is important you are not just using off the shelf sealants that suited to indoor DIY tasks around the house. You need RV specific caulks and below are the best for the job.
The primary difference between caulk and sealants lies in their flexibility. RV sealants are more flexible when dry, making them ideal for areas subject to movement, such as roof and wall seams, doors and windows.
Top RV Sealant Options For RVs
Choosing the right sealant for your RV’s exterior is crucial for preventing water damage, reducing noise and maintaining your vehicle’s integrity.
ProFlex RV, Dicor 551, Sikaflex 221, and Lexel are all excellent options, each with their own strengths.
ProFlex RV
Excellent for sidewall applications, especially on aluminum and fiberglass. It’s clear, won’t yellow, and adheres well to old (properly prepared) ProFlex.
Dicor 551
Designed for sidewall and non-sag applications on RV roofing corner joints. It works well with various materials including EPDM, TPO, aluminum, fiberglass, steel, and wood.
Sikaflex 221
A polyurethane non-sag sealant, ideal for sidewall applications.
Lexel
Highly recommended by RV dealers for its versatility and performance.
Application Tips for RV Sealant
Regular inspections are always recommended and it is advisable to check your RV’s exterior seals every six months to catch and address any issues early.
Always clean the surface thoroughly and remove any old sealant before applying new product.
Apply a bead size of 1/4 inch to 3/8 inch for optimal results, especially with products like Dicor 551 that may shrink. Also note some products, like Lexel, cure very quickly, giving you only about 10 seconds for tooling.
Use self-leveling caulk for horizontal surfaces and non-sag formulas for vertical applications.
FAQs
How Often Should I Reapply RV Sealant?
Typically, you should inspect and potentially reapply sealant every 6-12 months, depending on your RV’s exposure to weather conditions and usage. Look for signs of cracking, peeling, or separation.
Can I Apply RV Sealant in Cold Weather?
Most RV sealants work best when applied in temperatures between 40-90°F (4-32°C). Some specialized products can be applied at lower temperatures, but always check the manufacturer’s specific instructions.
How Long Does RV Sealant Take to Cure?
Curing times vary by product. Some sealants skin over in 30 minutes but may take 24-48 hours to fully cure. Always allow the recommended curing time before exposing the sealed area to water or stress.
Can I Paint Over RV Sealant?
Not all sealants are paintable. Products like Dicor and Lexel typically remain unpaintable. If you need a paintable option, look for specific paintable RV sealants or consult the manufacturer’s guidelines.
Are RV Sealants Waterproof?
Most quality RV sealants are waterproof, but it’s crucial to apply them correctly and choose a product specifically designed for exterior RV use. Always check the product specifications for water resistance.
Can I Use Household Caulk on My RV?
No, household caulk is not suitable for RV exteriors. It lacks the flexibility, UV resistance, and durability required for RV applications. Always use a specialized RV sealant.