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Permatex 27038 Optimum Red High Temperature Gasket Maker is a premium silicone sealant designed for professional mechanics and serious DIYers. It withstands extreme intermittent temperatures up to 750ยฐF (399ยฐC), meets OEM specifications, and offers sensor-safe, non-corrosive, low-odor performance. Perfect for headers, manifolds, turbochargers, and slip-fit exhaust parts, it resists aging and thermal cycling without cracking or shrinking, ensuring a durable, reliable seal every time.
| ASIN | B08CRYCZ91 |
| Best Sellers Rank | #37,598 in Automotive ( See Top 100 in Automotive ) #163 in Automotive Fillers, Adhesives & Sealants |
| Brand Name | Permatex |
| Color | Optimum Red |
| Customer Reviews | 4.7 4.7 out of 5 stars (431) |
| EU Spare Part Availability Duration | 5 Years |
| Included Components | Optimum Red High Temperature Gasket Maker |
| Item Thickness | 0.2 Inches |
| Item Type Name | Permatex Optimum Red High Temperature Gasket Maker 3.35 oz |
| Manufacturer | Permatex |
| Material Type | Silicone |
| UPC | 686226987631 686226270382 |
| Unit Count | 1 Count |
| Upper Temperature Rating | 750 Degrees Fahrenheit |
T**B
Not sure what is up with the toothpaste tubes but the caps all brake now. They also always get holes in them and dry out. Tired of messing with that so got these cans. One came with a broke nozzle but it is still useable. pretty easy to use and less mess than the toothpaste tubes.
J**N
I recently used the Permatex 27038 Optimum Red RTV Silicone to install my intake manifold, and Iโm incredibly impressed with its performance! This silicone sealant was very simple to use, applying smoothly and evenly without any mess. It formed a strong, reliable seal that held up perfectly under high temperatures and pressure, ensuring my intake manifold installation was rock-solid. The product lived up to its promises, providing excellent adhesion and durability. I highly recommend this RTV silicone for any automotive sealing needs!
J**K
This stuff is great. You must follow the instructions though. Donโt just apply and go.
S**Y
All good ๐
G**G
Used to seal exhaust manifold gasket on tractor. Several months with no leakage. If using on manifolds, just put a thin bead on both sides of gasket, just around the ports. Also used to seal exhaust studs on tractor that penetrated coolant jacket. No coolant leaks.
Trustpilot
1 month ago
2 weeks ago