---
product_id: 10217434
title: "Patch - Black 4 oz - Filler & Seam Sealer | Ultimate Filler Adhesive | Patches Holes, Cracks in Steel, Wood, and Some Plastics | Strengthen Weakened Metal"
brand: "por-15"
price: "VT13137"
currency: VUV
in_stock: true
reviews_count: 12
category: "Por 15"
url: https://www.desertcart.vu/products/10217434-patch-black-4-oz-filler-and-seam-sealer-ultimate-filler
store_origin: VU
region: Vanuatu
---

# 100% waterproof & solvent-proof Adds strength to weakened metal Rock-hard cure in 96 hrs Patch - Black 4 oz - Filler & Seam Sealer | Ultimate Filler Adhesive | Patches Holes, Cracks in Steel, Wood, and Some Plastics | Strengthen Weakened Metal

**Brand:** por-15
**Price:** VT13137
**Availability:** ✅ In Stock

## Summary

> 🛡️ Seal it once, fix it forever — the ultimate patch for pros who demand strength and reliability.

## Quick Answers

- **What is this?** Patch - Black 4 oz - Filler & Seam Sealer | Ultimate Filler Adhesive | Patches Holes, Cracks in Steel, Wood, and Some Plastics | Strengthen Weakened Metal by por-15
- **How much does it cost?** VT13137 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/10217434-patch-black-4-oz-filler-and-seam-sealer-ultimate-filler)

## Best For

- por-15 enthusiasts

## Why This Product

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

## Key Features

- • **Trusted by Experts:** Backed by POR-15’s renowned rust prevention system and a 4.7-star rating from over 1,200+ users.
- • **Unmatched Durability:** Dries to a rock-hard, non-porous finish that resists fuels, solvents, and moisture for permanent repairs.
- • **Versatile Application:** Seals holes, cracks, and seams in steel, wood, and select plastics—perfect for automotive, marine, and home projects.
- • **Long-Lasting Protection:** Prevents rust reoccurrence by creating an airtight, waterproof bond that won’t crack, chip, or peel.
- • **Professional-Grade Strength:** May actually reinforce weakened metal, saving costly part replacements and extending equipment life.

## Overview

POR-15 Patch is a high-viscosity urethane filler and seam sealer that cures to a rock-hard, waterproof finish in 4-6 hours (full cure in 96 hours). Designed for steel, wood, and some plastics, it permanently seals cracks and holes while preventing rust by forming an airtight, solvent-resistant barrier. Trusted by professionals and DIYers alike, it can even add structural strength to weakened metal surfaces.

## Description

POR-15 is a rust-preventive paint designed for application directly on rusted or seasoned metal surfaces. It dries to a rock-hard, non-porous finish that won't chip, crack, or peel, and it prevents rust from re-occurring by protecting metal from further exposure to moisture.

Review: Superior Product if Applied Correctly - I've used POR-15 paint before and I consider it to be a superior product if applied correctly. I painted a 300 gallon fuel tank in the boat with POR-15 and the tank came out fantastic. 1978 boat and the fuel tank is still in the boat looking great... So what happened was I discovered 3 pinholes in the oil pan of the diesel in another boat. This is a Mack E7M, which isn't made any more and which is getting harder and harder to find parts for. What to do? Spend $10,000 or more to pull the motor and hope to find a new pan? Even if I find a new pan, should I put this old motor back in knowing parts are virtually non-existent? POR-15 Patch to the rescue. I used the black patch but I probably should have used the gray, which has metal flakes in it. Regardless, the patch worked. It's holding, even at 60 PSI cold and 50 PSI hot. What I did: Bought the paint kit in addition to the patch. This kit includes the alkaline degreaser, the primer, a small can of POR-15 paint, a pair of gloves, and foam applicator. I bought the kit intending to use the degreaser and primer, and maybe touch up with paint. Turned out, lying in the bilge, the only way to apply the patch was with a heavy rubber glove. I used some fiberglass mat material as well but I didn't need to and looking back wish I hadn't. Step one: Dilute degreaser, wire brush off loose rust, wipe clean, then wash area to be treated with degreaser. Step two: Thoroughly rinse degreaser off with fresh water. Step three: Thoroughly dry. Step four: (for bare metal): Apply primer. Step five: Slather on patch as thick as you want. Cure time is 4 days. That's a long time but it's worth waiting. POR 15 is not a rust converter. It's a urethane treatment that cures to a very hard finish and bonds extremely strongly to etched or rusted surfaces. It stop rust because it creates a waterproof, airtight bond to the rusted surface. The curing rate will be slower the thicker the coating, but humidity or moisture will accelerate to process because it is a urethane based product. It's very important that your surface be prepped correctly and absolutely dry before applying product. This tube of patch has saved me tthoysand of dollars.
Review: Works amazing. - Worked as advertised, dried like steel. Was super easy to use on a rusted corner of a truck before I bedlined over it. Also sealed the drip edge before bedline. The next day it was solid as solid can be.

## Features

- ✅ WHY CHOOSE POR-15 PATCH? - POR-15 Patch is quite literally POR-15 Rust Preventive Coating in a tube. Remains flexible while working and dries rock hard becoming impervious to fuels and solvents. It’s so tough it may actually add strength to weakened metal!
- ✅ ALL PURPOSE PATCH – While wearing protective gloves - POR-15 Patch must be applied to dry surfaces only. Dries to touch in 4-6 hours but full cure may take up to 96 hours depending on thickness applied. Once dry, POR-15 Patch cannot be removed by any solvent. Keep cap and threads clean before resealing. POR-15 Patch dries to a rock-hard finish and sanding is very difficult, so we don’t recommend use on car exterior parts if a cosmetic finish is desired.
- ✅ PERMANENTLY SEALS SEAMS - Unlike conventional body fillers, POR-15 Patch won’t absorb moisture and swell. It dries to a rock-hard finish that won’t crack or chip & cannot be removed by any solvent for a permanent seal.
- ✅ WHEN DO I NEED THIS? – Patch permanently seals loose furniture joints, patches holes in steel, wood, and some plastics, fix fuel tanks & floor pans, bond steel, and repair concrete & cinder blocks. – You name it, POR015 Patch offers versatility across all your projects.
- ✅ OUR SATISFACTION COMMITMENT - At POR-15 we strive to bring the ultimate in rust prevention. Known for the unbeatable 3-step stop rust system, POR-15 is trusted by DIY & Professionals. We are committed to innovation, quality control, and excellent customer service.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00J594AQ2 |
| Best Sellers Rank | #32,250 in Automotive ( See Top 100 in Automotive ) #50 in Automotive Sealers #207 in Interior & Exterior House Paint |
| Brand | POR-15 |
| Color | Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,267) |
| Date First Available | March 21, 2014 |
| Full Cure Time | 96 Hours |
| Global Trade Identification Number | 00051491490139 |
| Is Discontinued By Manufacturer | No |
| Item Form | Liquid, Paste |
| Item Package Quantity | 1 |
| Item Volume | 118 Milliliters |
| Item Weight | 6.1 ounces |
| Item model number | 49013 |
| Manufacturer | POR-15 |
| Manufacturer Part Number | 49013 |
| Material | Steel,Wood |
| Model | 49013 |
| Number of Pieces | 15 |
| OEM Part Number | 49013 |
| Package Information | Tube |
| Product Dimensions | 3.44 x 0.69 x 0.59 inches |
| Special Feature | Waterproof |
| Special Features | Waterproof |
| Specific Uses For Product | Repair |
| UPC | 051491490139 |
| Unit Count | 4.0 Fluid Ounces |
| Viscosity | High |
| Viscosity Level | High |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** POR-15
- **Item Form:** Liquid, Paste
- **Material:** Steel,Wood
- **Special Feature:** Waterproof
- **Specific Uses For Product:** Repair

## Images

![Patch - Black 4 oz - Filler & Seam Sealer | Ultimate Filler Adhesive | Patches Holes, Cracks in Steel, Wood, and Some Plastics | Strengthen Weakened Metal - Image 1](https://m.media-amazon.com/images/I/61wjXZyrkVL.jpg)

## Questions & Answers

**Q: The description in the pic says "...it dries as hard as a rock, remains flexible". Does anyone see a problem with that? How can this product be both?**
A: That claim is 100% true. It's the consistency of pudding for example. Can be drilled, tapped or sanded etc. Also makes a great adhesive when mounting parts. Dries rock hard, but does in fact remain a flexible product. Not flexible like a cured silicone, but can be bent or beat on with a hammer and remains intact. Very good product and that comes from personal use.

**Q: Would this be okay to use for small rust hole in fender?**
A: Yes...I repaired more than a few 1" holes in my VW Bug floor pan.  This will stick to rust, but make sure to sand the surface, thoroughly clean all grease,oil wax & remove anything loose.  For my 1" holes, I backed the holes with Por 15 "Power Mesh" reinforcing fabric.  You could also use fiberglass fabric.  Go to por15.com  they have instructions on the use of all products.

**Q: Will the open tube dry up like the paint?**
A: Hi yes but if you clean the threads off with thinner it will make it easer to take the cap back off, it only gets hard in the tip so I use my drill press to open the tube back up in the tip just take the cap off and easy the drill press down in to the tips and the hard epoxy will come out and you can use the rest of it.

**Q: Do i need to use this before the rust preventive paint? should i apply it after? thanks in advance**
A: You can apply the POR patch after applying the rust preventative paint.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Superior Product if Applied Correctly
*by B***Y on July 20, 2017*

I've used POR-15 paint before and I consider it to be a superior product if applied correctly. I painted a 300 gallon fuel tank in the boat with POR-15 and the tank came out fantastic. 1978 boat and the fuel tank is still in the boat looking great... So what happened was I discovered 3 pinholes in the oil pan of the diesel in another boat. This is a Mack E7M, which isn't made any more and which is getting harder and harder to find parts for. What to do? Spend $10,000 or more to pull the motor and hope to find a new pan? Even if I find a new pan, should I put this old motor back in knowing parts are virtually non-existent? POR-15 Patch to the rescue. I used the black patch but I probably should have used the gray, which has metal flakes in it. Regardless, the patch worked. It's holding, even at 60 PSI cold and 50 PSI hot. What I did: Bought the paint kit in addition to the patch. This kit includes the alkaline degreaser, the primer, a small can of POR-15 paint, a pair of gloves, and foam applicator. I bought the kit intending to use the degreaser and primer, and maybe touch up with paint. Turned out, lying in the bilge, the only way to apply the patch was with a heavy rubber glove. I used some fiberglass mat material as well but I didn't need to and looking back wish I hadn't. Step one: Dilute degreaser, wire brush off loose rust, wipe clean, then wash area to be treated with degreaser. Step two: Thoroughly rinse degreaser off with fresh water. Step three: Thoroughly dry. Step four: (for bare metal): Apply primer. Step five: Slather on patch as thick as you want. Cure time is 4 days. That's a long time but it's worth waiting. POR 15 is not a rust converter. It's a urethane treatment that cures to a very hard finish and bonds extremely strongly to etched or rusted surfaces. It stop rust because it creates a waterproof, airtight bond to the rusted surface. The curing rate will be slower the thicker the coating, but humidity or moisture will accelerate to process because it is a urethane based product. It's very important that your surface be prepped correctly and absolutely dry before applying product. This tube of patch has saved me tthoysand of dollars.

### ⭐⭐⭐⭐⭐ Works amazing.
*by J***I on July 10, 2025*

Worked as advertised, dried like steel. Was super easy to use on a rusted corner of a truck before I bedlined over it. Also sealed the drip edge before bedline. The next day it was solid as solid can be.

### ⭐⭐⭐⭐⭐ Works well
*by T***A on August 2, 2025*

Good stuff. Impervious to gasoline Works well when used in thin layers as opposed to heavy. (Will take a lot longer to dry).

## Frequently Bought Together

- POR-15 Patch - Black 4 oz - Filler & Seam Sealer | Ultimate Filler Adhesive | Patches Holes, Cracks in Steel, Wood, and Some Plastics | Strengthen Weakened Metal
- POR-15 Metal Prep, Metal Etching Rust Neutralizer, Non-flammable and Water-based, 32 Fluid Ounces, 1-quart
- POR-15 Rust Preventive Coating, Stop Rust and Corrosion Permanently, Anti-rust, Non-porous Protective Barrier, 32 Fluid Ounces, Semi-gloss Black

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-03-07*