--- product_id: 31955424 title: "Metacaulk 150+ 66389 Firestop Sealant, Easy Application, Firestop, 5 Gal." brand: "rectorseal" price: "R23308" currency: ZAR in_stock: true reviews_count: 2 category: "Rectorseal" url: https://www.desertcart.co.za/products/31955424-metacaulk-150-66389-firestop-sealant-easy-application-firestop-5-gal store_origin: ZA region: South Africa --- # Water-based & water resistant 4-hour fire rating Easy retrofit & application Metacaulk 150+ 66389 Firestop Sealant, Easy Application, Firestop, 5 Gal. **Brand:** rectorseal **Price:** R23308 **Availability:** ✅ In Stock ## Summary > 🔥 Seal the deal with confidence—firestop that works as hard as you do! ## Quick Answers - **What is this?** Metacaulk 150+ 66389 Firestop Sealant, Easy Application, Firestop, 5 Gal. by rectorseal - **How much does it cost?** R23308 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/31955424-metacaulk-150-66389-firestop-sealant-easy-application-firestop-5-gal) ## Best For - rectorseal enthusiasts ## Why This Product - Trusted rectorseal brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Dynamic Flexibility:** Cures to an elastomeric seal that adapts to movement, perfect for construction joints and penetrations. - • **Eco & User Friendly:** VOC compliant, paintable, freeze-thaw resistant, and ready to use straight from the container. - • **Effortless Application:** Water-based, non-sag formula applies smoothly from tube, sausage pack, or pail—no special skills needed. - • **Unmatched Fire Defense:** Rated up to 4 hours per ASTM E814 & E1966 standards for ultimate firestop protection. - • **Versatile Compatibility:** Seals metal, insulated pipes, fiberglass, plastic, cables, and more—ideal for HVAC, plumbing, electrical trades. ## Overview RectorSeal Metacaulk 150+ is a professional-grade, water-based firestop sealant designed for construction joints and penetrations. It offers up to 4 hours of fire resistance, is easy to apply without special prep, and cures to a flexible, durable barrier that prevents fire, smoke, hot gases, and water spread. Compatible with multiple surfaces and trades, it’s VOC compliant and paintable, making it the go-to solution for millennial pros demanding safety and efficiency. ## Description Product Description RectorSeal firestop sealant prevents the spread of fire, smoke, hot gasses, and water. Used for construction joints and through penetrations. Can also be used on metal, insulated pipe, fiberglass, plastic pipe, wall joint, power, telephone, and datacomm cables. Water based, non-sag caulking, grade heat resistant sealant that is easy to apply as well as retrofit. Cures to an elastomeric seal that is suitable where dynamic movement is expected. Can be applied from a tube, sausage pack, or pail. Applied with a conventional caulking gun, bulk loading gun, or can be troweled from the pail. All systems rated for up to 4 hours as per ASTM E814 (UL1479) and ASTM E1966 (UL 2079) test standards. For temperature applications of 120 degrees fahrenheit, providing flexible barrier protection. For interior use and paintable, with excellent freeze-thaw capability. FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets. From the Manufacturer Metacaulk MC 150+ is an in tumescent, one-component, general purpose, fire-rated sealant and smoke seal for construction joints and through-penetrations. A water-based, non-sag caulking grade sealant that is easy to apply as well as to retrofit. An economic choice for most common applications. Review: very good material - We use this for sealing all the fire rated areas as it requires Review: Great Value! - Most cost effective source I have found for this product. ## Features - APPLICATION: Firestop sealant prevents the spread of fire, smoke, hot gasses, and water; for construction joints and through penetrations; can be used on metal, insulated pipe, fiberglass, plastic pipe, wall joint, power, telephone, and datacomm cables - EASY INSTALLATION: Water based, non-sag caulking, grade heat resistant sealant that is easy to apply as well as retrofit; it cures to an elastomeric seal that is suitable where dynamic movement is expected; can be applied from a tube, sausage pack, or pail; applied with a conventional caulking gun, bulk loading gun, or can be troweled from the pail - SPECIFICATIONS: All systems rated for up to 4 hours as per ASTM E814 (UL1479) and ASTM E1966 (UL 2079) test standards; for temperature applications of 120 degrees fahrenheit; flexible barrier protection; interior use and paintable; excellent freeze-thaw caulk; VOC compliant - CONVENIENT: No special skills required to apply firestop sealant; the sealant does not have to be pre-mixed - FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B008A3UB26 | | Best Sellers Rank | #82,330 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #91 in Industrial Joint Sealants | | Brand | Rectorseal | | Brand Name | Rectorseal | | Color | Red | | Customer Reviews | 5.0 out of 5 stars 13 Reviews | | Full Cure Time | 4 hours | | Included Components | 5 Gallon Pail | | Item Form | Spray, caulk, gun or trowel | | Item Weight | 3 pounds | | Liquid Volume | 5 gallons | | Manufacturer | Rectorseal | | Material Type | Water-based and non-sag. VOC compliant | | Model | 66389 | | Number of Items | 1 | | Part Number | 66389 | | Surface Recommendation | Indoor/ Outdoor | | Temperature Range | 120 °F | | UPC | 021449663892 | | Unit Count | 1 Count | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** Rectorseal - **Color:** Red - **Full Cure Time:** 4 hours - **Item Weight:** 3 pounds - **Liquid Volume:** 5 gallons ## Images ![Metacaulk 150+ 66389 Firestop Sealant, Easy Application, Firestop, 5 Gal. - Image 1](https://m.media-amazon.com/images/I/51GRZza2rEL.jpg) ## Available Options This product comes in different **Number Of Items** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ very good material *by S***R on September 24, 2020* We use this for sealing all the fire rated areas as it requires ### ⭐⭐⭐⭐⭐ Great Value! *by R***O on July 20, 2019* Most cost effective source I have found for this product. ## Frequently Bought Together - Rectorseal 66389 5-Gallon Pail Metacaulk Mc 150+ Firestop Sealant , Red - Rectorseal 66385 20.2-Ounce Sausage Pack Metacaulk Mc 150+ Firestop Sealant - AWF PRO Sausage Caulk Gun - 20 oz Foil Pack / 10 oz Cartridge Convertible, Aluminum Sausage Caulking Gun, Replaceable Tips Included --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.za/products/31955424-metacaulk-150-66389-firestop-sealant-easy-application-firestop-5-gal](https://www.desertcart.co.za/products/31955424-metacaulk-150-66389-firestop-sealant-easy-application-firestop-5-gal) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-08-19*