Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
⚠️ California Proposition 65 Warning : Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
BlueDevil Radiator & Block Sealer is an easy-to-use formula that will repair and seal leaks in radiators and/or engine blocks. It does not contain solid or fibrous materials and will not clog or harm cooling systems. It will bond to plastic, cast iron, aluminum, alloy or metal. BlueDevil Block Sealer is compatible in gasoline and diesel engines. It is a guaranteed permanent radiator sealer.
Unfortunately, the Blue Devil Block Sealer arrived with a dented container. I still used it, but it barely worked on my radiator. I had higher hopes since I heard good things, but I guess I got a dud. Disappointed with the quality control.
J
Jasmine Lee
Mixed results, but it worked eventually
I wasn't sure if the Blue Devil sealer would work on my car's radiator leak. The instructions could've been clearer, and it took a couple of tries before it fully sealed. But after a few days, it finally did its job. Just be patient if it doesn't work right away!
C
Carlos Mendoza
Great for sealing my old radiator
I used the Blue Devil Radiator Block Sealer to fix a leak in my aging radiator. The 16-ounce bottle was just enough to seal it up, and I noticed a difference immediately. It's been a few weeks now with no leaks, so I'm pretty happy with the purchase!
Free Shipping
Quality Support
Return & Refund
Gift Voucher
FAQs
Have a question ? We are here to help.
Is the shipping free?
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.
