---
product_id: 20174839
title: "Prosoco R-Guard Joint and Seam Filler"
brand: "prosoco"
price: "€ 88.88"
currency: EUR
in_stock: true
reviews_count: 8
category: "Prosoco"
url: https://www.desertcart.fi/products/20174839-prosoco-r-guard-joint-and-seam-filler
store_origin: FI
region: Finland
---

# Water-resistant formula 4-hour full cure time Gun-grade, fiber-reinforced paste Prosoco R-Guard Joint and Seam Filler

**Brand:** prosoco
**Price:** € 88.88
**Availability:** ✅ In Stock

## Summary

> 🛡️ Seal smart, build strong — don’t let gaps hold you back!

## Quick Answers

- **What is this?** Prosoco R-Guard Joint and Seam Filler by prosoco
- **How much does it cost?** € 88.88 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/20174839-prosoco-r-guard-joint-and-seam-filler)

## Best For

- prosoco enthusiasts

## Why This Product

- Trusted prosoco brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Fast 4-Hour Cure:** Get your projects moving with a rapid full cure time that minimizes downtime and maximizes efficiency.
- • **Seamless Integration:** Designed to perfectly prep surfaces for R-GUARD FastFlash and other air/water barriers, ensuring a continuous, reliable protective envelope.
- • **Precision Application:** Gun-grade consistency ensures smooth, controlled application—perfect for professional finishes on joints, seams, and cracks.
- • **Hybrid STPE Technology:** Experience the best of silicone and polyurethane in one easy-to-apply, fiber-reinforced compound for unmatched flexibility and strength.
- • **Superior Water Resistance:** Protect your walls with a durable, water-resistant seal that stands up to the elements and keeps moisture out.

## Overview

Prosoco R-Guard Joint and Seam Filler is a high-performance, single-component STPE paste designed for prepping joints, seams, and cracks before applying air and water barriers. With a fast 4-hour cure, water-resistant durability, and a fiber-reinforced formula combining silicone and polyurethane benefits, it ensures professional-grade sealing and long-lasting protection in new or existing wall assemblies.

## Description

Buy Prosoco R-Guard Joint and Seam Filler: Putty - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Great product - My husband absolutely loved this product. Worth the money and easy to use. Dries fast, appearance is a terracotta color when applied. Very durable and great quality. Will buy product again.
Review: Good stuff, needed more than recommended - Worked as expected. I don’t think it covers as much as it says. We used it as recommend by Matt Risinger from the Build Show. It made it a third way around the building base (40x40) with 3 tubes. Felt like I should have made it a little thicker like the videos showed but it sealed nicely still.

## Features

- Utilize Joint & Seam Filler to prepare open joints, seams and cracks before installing R-GUARD FastFlash; any R-GUARD Primary Air & Water-Resistive Barrier; or other waterproofing and air barrier components in new or existing wall assemblies.
- Joint & Seam Filler is a high modulus, gun-grade crack and joint filler, adhesive and detailing compound that combines the best of silicone and polyurethane properties.
- This single-component, fiber-reinforced, Silyl-Terminated-Poly-Ether (STPE) is easy to gun, spread and tool.
- Use Joint & Seam Filler to fill openings and create transitions where flexible reinforcement is required to bridge gaps and provide continuous support of fluid-applied flashing membranes, waterproofing or air barrier components.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00OBUXCJ6 |
| Best Sellers Rank | #74,241 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #64 in Industrial Joint Sealants |
| Brand | Prosoco |
| Date First Available | October 9, 2014 |
| Full Cure Time | 4 Hours |
| Is Discontinued By Manufacturer | No |
| Item Form | Paste |
| Item Weight | 1.9 pounds |
| Item model number | 5824052562 |
| Liquid Volume | 20 Fluid Ounces |
| Manufacturer | Prosoco |
| Material | Silyl-Terminated-Poly-Ether (STPE) |
| Number of Items | 4 |
| Product Dimensions | 12 x 2 x 2 inches |
| Surface Recommendation | Walls |
| UPC | 653429020212 |
| Unit Count | 20 Ounce |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** Prosoco
- **Full Cure Time:** 4 Hours
- **Item Form:** Paste
- **Liquid Volume:** 20 Fluid Ounces
- **Surface Recommendation:** Walls

## Images

![Prosoco R-Guard Joint and Seam Filler - Image 1](https://m.media-amazon.com/images/I/51cc2sLofaL.jpg)

## Available Options

This product comes in different **Unit Count, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product
*by L***R on May 1, 2024*

My husband absolutely loved this product. Worth the money and easy to use. Dries fast, appearance is a terracotta color when applied. Very durable and great quality. Will buy product again.

### ⭐⭐⭐⭐⭐ Good stuff, needed more than recommended
*by S***M on August 10, 2020*

Worked as expected. I don’t think it covers as much as it says. We used it as recommend by Matt Risinger from the Build Show. It made it a third way around the building base (40x40) with 3 tubes. Felt like I should have made it a little thicker like the videos showed but it sealed nicely still.

### ⭐⭐⭐⭐⭐ Fill those gaps between any building materials!
*by M***R on March 12, 2022*

Prosoco R-Guard Joint & Seam Filler (and related Fast Flash) works as described to seal the gaps between different building materials. Tape and caulk products aren't all-purpose as liquid flashing products, where you apply a large bead in bulk, and then spread as needed for the situation. Corners, odd shapes, vertical, horizontal, works equally well inside tight spaces as it does across large flat areas. You can push the liquid flashing into cracks in the same way that caulk is applied, plus you spread it out with a plastic fin or other spreader tool. Cleans up easy with paper towels before it dries. The finished product is a rubberish mastic that provides a permanent barrier to water, air and insects. Cure (drying) time is dependent on humidity. If you're working in a very dry environment (e.g. below 50% humidity), a small amount of water misting with a spray bottle will speed things up. I'm in central Texas and find most days that I can spread the joint and seam filler in the morning, and then after lunch apply the fast flash. On especially dry days, I'll lightly mist the substrate before applying the joint and seam filler, and then mist the finished spread after all spreading/tooling is completed. A great benefit, rain isn't a worry - you can apply these products and not worry about rain later in the day! For those that live in desert conditions, best to wait a day for each round (e.g. day 1, apply joint and seam filler, day 2, apply fast flash, day 3, continue). Note - if you apply the joint and seam filler especially thick to fill large voids, it may take longer to fully cure (dry). The joint and seam filler is pink and reinforced with fibers, designed to fill large gaps between material, goes on very thick and the finished surface isn't as smooth/flat in comparison to the fast flash. Some use the joint and seam filler by itself where other materials will cover it up, but Prosoco recommends a top coat using the fast flash product over the joint and seam filler. Fast flash can be used by itself, or on top of the joint and seam filler. Dark red in color, nearly the same product as the joint and seam filler, but less fiber reinforcement to allow being applied as a thin top-coat that finishes smooth and sexy! You can paint the fast flash product after it drys/cures. Painting the joint and seam filler isn't recommended, as it finishes with a rough surface, not intended to be visible. Paint is only necessary if you're planning to leave the finished spread exposed to sunlight (UV) indefinitely. These products are designed to be hidden behind other materials (e.g. sheathing, siding, trim, etc.) when the building is complete. Applied successfully along the foundation between concrete and base angle (e.g. sill plate) for metal buildings, workshops, and barndominiums. Also used at all penetrations, windows, doors, etc. Works great for commercial and residential construction across a wide variety of materials! Liquid flashing provides a rubber gasket-like finish that allows screws and nails to penetrate after spreading, while maintaining full waterproofing. Liquid flashing products are more expensive than tape and caulk products. Liquid flashing products are more effective, harder-to-get-wrong and thereby longer-lasting than tape and caulk products. Yes, liquid flashing is messy, but after a few projects you and/or the crew will find it easier to work with compared to tapes. I'm averaging 20~30 linear feet per 20-ounce tube of the joint and seam filler. I'm probably using a lot more than is necessary. I'm getting 30+ feet per 20-ounce tube of fast flash, and it goes on thinner. Big thanks to Matt and the Build Show Network, plus the manufacturer videos on YouTube for Prosoco, Huber, and PolyWall! Liquid flashing and spray/rolled/painted/spread weather barriers are definitely a better answer for a wide variety of use cases compared to tapes, caulks, and wraps. Welcome to the 21st century!

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-22*