--- product_id: 59858689 title: "27037 Optimum Max Flex RTV Silicone Black Gasket Maker, 3 oz" brand: "permatex" price: "S$15" currency: SGD in_stock: true reviews_count: 13 category: "Permatex" url: https://www.desertcart.sg/products/59858689-27037-optimum-max-flex-rtv-silicone-black-gasket-maker-3 store_origin: SG region: Singapore --- # Temp range -65Β°F to 500Β°F Sensor-safe & non-corrosive 15% stronger than Ultra Black 27037 Optimum Max Flex RTV Silicone Black Gasket Maker, 3 oz **Brand:** permatex **Price:** S$15 **Availability:** βœ… In Stock ## Summary > πŸ”§ Seal like a pro, flex like a boss. ## Quick Answers - **What is this?** 27037 Optimum Max Flex RTV Silicone Black Gasket Maker, 3 oz by permatex - **How much does it cost?** S$15 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/59858689-27037-optimum-max-flex-rtv-silicone-black-gasket-maker-3) ## Best For - permatex enthusiasts ## Why This Product - Trusted permatex brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Precision Application:** Includes 2 nozzles for controlled, mess-free gasket making every time - β€’ **Sensor-Safe & Low Odor:** Safe for sensitive engine components with a clean, low-odor formula - β€’ **Extreme Temperature Resilience:** Performs flawlessly from -65Β°F to 500Β°F, handling the heat and cold like a pro - β€’ **Unmatched Strength & Durability:** 15% stronger than Ultra Black for a seal that won’t quit - β€’ **Maximum Flexibility & Oil Resistance:** 60% more flexible than Ultra Black, resisting oil and vibration for long-lasting seals ## Overview Permatex 27037 Optimum Black Gasket Maker is a premium silicone-based sealant engineered for modern lightweight and premium automotive components. It offers superior strength, flexibility, and oil resistance, with a wide temperature tolerance from -65Β°F to 500Β°F. Sensor-safe and low odor, it ensures reliable, vibration-resistant seals on valve covers, oil pans, and more, making it the #1 choice for professional-grade gasket sealing. ## Description Permatex optimum black is designed for gasket making in newer lightweight and premium components where maximum oil resistance is required, specifically within assemblies where two unlike materials meet. Optimum black is ideal for use with valve covers, oil pans, oil pumps, intake manifold end seals, timing gear covers and differential covers. Review: Good sealant. Used it before and it holds up very well. - I used this to plump up the sunroof gasket on my Jaguar XF's glass roof seal. It doesn't leak water, but wind noise has been annoying since day one... I finally ran a thin bead of this around the outside of the seal, where it meets with the roof and gently thinned it with my finger. No more wind noise, and the goo stays attached to the existing base gasket. Problem solved. I've used this on other things in the past as well, gas tank neck seal for hedge trimmer, anybody who's had to work on those tanks know how sloppy they are these days... little dab of this stuff, no more leaks! It doesn't stink, and it cleans up well as long as you're quick about cleaning up. I have no complaints, it does exactly what it needs to do! Review: No complaints here - These sealants work great. ## Features - Sensor-safe, low odor, and non-corrosive - Meets performance Specs of OE silicone gaskets. Resistant to Auto & shop fluids and vibration. 15% stronger than Ultra Black. - Retains highest flexibility with maximum oil resistance through use of a patented adhesion system. 60% more flexible than Ultra Black - Temperature range: -65 DegreeF to 500 DegreeF (-54 DegreeC to 260 DegreeC) intermittent - Includes 2 nozzles ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B072MRCG8W | | Best Sellers Rank | #57 in Automotive ( See Top 100 in Automotive ) #1 in Gasket Sealers #752 in Oils & Fluids | | Brand | Permatex | | Brand Name | Permatex | | Color | Optimum Black | | Compatible Material | Metal, Rubber | | Customer Reviews | 4.7 out of 5 stars 718 Reviews | | Global Trade Identification Number | 00686226270375 | | Included Components | Gasket Maker | | Item Dimensions | 1.25 x 3.81 x 8 inches | | Item Form | Paste | | Item Type Name | Optimum Black Gasket Maker 3.35 oz | | Item Weight | 3 ounces | | Item dimensions L x W x H | 1.25 x 3.81 x 8 inches | | Manufacturer | Permatex | | Material | Silicone | | Material Type | Silicone | | Model | 27037 | | Number of Items | 1 | | Part Number | 27037 | | Style | Optimum | | Style Name | Optimum | | Surface Recommendation | Miscellaneous | | UPC | 686226270375 | | Unit Count | 1 Count | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** Permatex - **Item Weight:** 3 ounces - **Item dimensions L x W x H:** 1.25 x 3.81 x 8 inches - **Material:** Silicone - **Style:** Optimum ## Images ![27037 Optimum Max Flex RTV Silicone Black Gasket Maker, 3 oz - Image 1](https://m.media-amazon.com/images/I/712ZFo2pnCL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good sealant. Used it before and it holds up very well. *by K***S on September 30, 2026* I used this to plump up the sunroof gasket on my Jaguar XF's glass roof seal. It doesn't leak water, but wind noise has been annoying since day one... I finally ran a thin bead of this around the outside of the seal, where it meets with the roof and gently thinned it with my finger. No more wind noise, and the goo stays attached to the existing base gasket. Problem solved. I've used this on other things in the past as well, gas tank neck seal for hedge trimmer, anybody who's had to work on those tanks know how sloppy they are these days... little dab of this stuff, no more leaks! It doesn't stink, and it cleans up well as long as you're quick about cleaning up. I have no complaints, it does exactly what it needs to do! ### ⭐⭐⭐⭐⭐ No complaints here *by P***S on September 15, 2026* These sealants work great. ### ⭐⭐⭐⭐⭐ Highly recommend gasket maker *by I***7 on March 10, 2026* I brought this gasket maker when I was changing my CRV engine gasket. Very easy apply, dry very quick and adhesion very well. So far I don't see any issues and durability is good. It's very easy use making gasket and comes with everything you need. Good price for quality products. ## Frequently Bought Together - Permatex 27037 Optimum Black Gasket Maker, 3 oz - Permatex 27036 Optimum Grey Gasket Maker 3 oz - Permatex 27038 Optimum Red High Temperature Gasket Maker, 3 oz --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sg/products/59858689-27037-optimum-max-flex-rtv-silicone-black-gasket-maker-3](https://www.desertcart.sg/products/59858689-27037-optimum-max-flex-rtv-silicone-black-gasket-maker-3) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-10-17*