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💧 Seal it once, seal it right — waterproof confidence that lasts a lifetime!
BioSeal General Purpose BLACK is a premium 100% silicone sealant designed for ultimate waterproof protection and durability. It cures to a matte black finish that resists yellowing, cracking, and odor for up to 50 years. Ready for water exposure in just 30 minutes, it’s perfect for kitchens, bathrooms, boats, and any high-moisture environment requiring a sleek, long-lasting seal.
| ASIN | B0BFCHRMFB |
| Best Sellers Rank | #35,452 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #64 in Silicone Caulk |
| Brand Name | ZERED |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (107) |
| Global Trade Identification Number | 00196852472208 |
| Included Components | 100% RTV Silicone |
| Initial Hardening Time | 30 Minutes |
| Item Form | Liquid |
| Item Weight | 10.1 Ounces |
| Liquid Volume | 10.1 Fluid Ounces |
| Manufacturer | zered |
| Material Type | Silicone |
| Surface Recommendation | Tile |
| Unit Count | 1.0 Count |
| Water Resistance Level | Waterproof |
H**R
Excellent product, used in kitchen.
I bought this in black to seal between new countertops and the tiled backsplash I installed in my kitchen. I’ve done a lot of home renovation over the years and I was impressed with how this product worked. Very thick but easily workable. Dried to a matte black so it blended in with my black grout and countertops quite well. Clean up was easy with isopropyl alcohol. Normally I use the silicone sealers from the home improvement stores but I found this stuff was a lot easier to work with, especially the clean up end. It does give off an odor but gone once dried. I’ll be using it again in the future.
J**E
Great product for boats
Works well for boat. Fills in holes and seals well great value. Has a slight smell but is not bad. Easy to put on with a basic caulk gun.
2**S
Great product for the RV
Easy to use and easy clean up with mineral spirits. I want to thank my friends over at RV TrueTopper for recommending this product.
J**E
Works great
Thank you
S**H
Great product if you can use it in four weeks. Check Use by Date.
Really like the product. Works great. My issue is that the product I received had a use date of July 2025. Not much time to finish a kitchen and three bathrooms where this was to be used. I notified the seller and they sent replacement items at no charge. I appreciate the response, BUT sending product with a Use By date of Aug 2025 is not much of an improvement.
N**E
Seals
If you need black silicone this is it! Slight shrinking but looks great. Price wasn't terrible and it was packaged nicely.
W**R
Black sealant
The price was good in the product work good
T**.
Smooth
Very smooth, easy to apply caulk. A little thinner than silicone, but hold shape perfect.
Trustpilot
1 month ago
2 weeks ago