---
product_id: 223608921
title: "Optimum Red"
brand: "permatex"
price: "£8.04"
currency: GBP
in_stock: true
reviews_count: 10
category: "Permatex"
url: https://www.desertcart.co.uk/products/223608921-optimum-red
store_origin: GB
region: United Kingdom
---

# Non-toxic & low odor Max temp 750°F (399°C) OEM Specified & sensor-safe Optimum Red

**Brand:** permatex
**Price:** £8.04
**Availability:** ✅ In Stock

## Summary

> 🔥 Seal the heat, own the street!

## Quick Answers

- **What is this?** Optimum Red by permatex
- **How much does it cost?** £8.04 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/223608921-optimum-red)

## 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

- • **Versatile Application:** Perfect for headers, manifolds, turbochargers, and slip-fit exhaust parts
- • **Sensor-Safe & Low Odor:** Safe for modern engines with sensitive sensors, no harsh fumes
- • **Extreme Heat Resistance:** Withstands scorching temps up to 750°F for ultimate durability
- • **Professional Grade Seal:** OEM specified formula trusted by mechanics and DIY pros alike
- • **Long-Lasting Flexibility:** Resists cracking, shrinking, and aging even under thermal cycling

## Overview

Permatex 27038 Optimum Red is a premium high-temperature RTV gasket maker designed for professionals and serious DIYers. It delivers maximum heat resistance up to 750°F (399°C), is OEM specified and sensor-safe, and offers a non-toxic, low-odor formula that resists aging and cracking. Ideal for sealing exhaust manifolds, headers, and turbochargers, it ensures a reliable, long-lasting gasket seal under extreme conditions.

## Description

Permatex’s NEW Optimum Red is an advanced maximum performance, max temperature RTV gasket maker. It resists aging, weathering and thermal cycling without hardening, shrinking or cracking. Premium professional gasket maker for today’s fast-paced heavy DIY’er and professional mechanics’ seeking a maximum temperature solution to withstand extreme temperatures up to 750°F (399°C) intermittent.

Review: Great quality and great price - This stuff always works great !
Review: Excellent high temp rtv on manifold. - 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.

## Features

- Maximum temperature performance
- OEM Specified, Sensor-safe, low odor, non-corrosive
- Non-flammable, non-toxic
- Can be used as a gasket maker or dressing and meets performance specs of OE silicone gaskets
- Top Job Applications: Header, manifold, slip-fit exhaust parts, turbocharge and withstands up to 750°F (399°C) intermittent

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08CRYCZ91 |
| Best Sellers Rank | #1,270 in Automotive ( See Top 100 in Automotive ) #3 in Gasket Sealers #1,085 in Oils & Fluids |
| Brand | Permatex |
| Brand Name | Permatex |
| Color | Optimum Red |
| Customer Reviews | 4.7 out of 5 stars 429 Reviews |
| 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 | Silicone |
| Material Type | Silicone |
| Model | 27038 |
| Part Number | 27038 |
| UPC | 686226987631 686226270382 |
| Unit Count | 1.0 Count |
| Upper Temperature Rating | 750 Degrees Fahrenheit |

## Product Details

- **Brand:** Permatex
- **Color:** Optimum Red
- **Item Thickness:** 0.2 Inches
- **Material:** Silicone
- **Upper Temperature Rating:** 750 Degrees Fahrenheit

## Images

![Optimum Red - Image 1](https://m.media-amazon.com/images/I/813a9mGj4BL.jpg)
![Optimum Red - Image 2](https://m.media-amazon.com/images/I/71vtP-BsvPL.jpg)
![Optimum Red - Image 3](https://m.media-amazon.com/images/I/81rmO7DIPTL.jpg)
![Optimum Red - Image 4](https://m.media-amazon.com/images/I/61xgYJAMY8L.jpg)
![Optimum Red - Image 5](https://m.media-amazon.com/images/I/61gTmL5sopL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great quality and great price
*by M***X on April 27, 2026*

This stuff always works great !

### ⭐⭐⭐⭐⭐ Excellent high temp rtv on manifold.
*by G***G on September 22, 2025*

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.

### ⭐⭐⭐⭐⭐ Works amazing
*by J***K on December 19, 2025*

This stuff is great. You must follow the instructions though. Don’t just apply and go.

## Frequently Bought Together

- Permatex 27038 Optimum Red High Temperature Gasket Maker, 3 oz
- Permatex 85080 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, Sensor Safe And Non-Corrosive, For High Flex And Oil Resistant Applications 9.5 oz
- Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. Tube

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**Shop now:** [https://www.desertcart.co.uk/products/223608921-optimum-red](https://www.desertcart.co.uk/products/223608921-optimum-red)

---

*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-23*