---
product_id: 70004582
title: "General Finishes Exterior 450 Water Based Topcoat, 1 Quart, Flat"
brand: "general finishes"
price: "€ 67.68"
currency: EUR
in_stock: true
reviews_count: 8
category: "General Finishes"
url: https://www.desertcart.ie/products/70004582-general-finishes-exterior-450-water-based-topcoat-1-quart-flat
store_origin: IE
region: Ireland
---

# Water-based formula, easy cleanup Fast drying, ready to sand in 1 hour UV absorbers for fade resistance General Finishes Exterior 450 Water Based Topcoat, 1 Quart, Flat

**Brand:** general finishes
**Price:** € 67.68
**Availability:** ✅ In Stock

## Summary

> ☀️ Elevate your outdoor wood game with fast-dry, fade-proof protection!

## Quick Answers

- **What is this?** General Finishes Exterior 450 Water Based Topcoat, 1 Quart, Flat by general finishes
- **How much does it cost?** € 67.68 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/70004582-general-finishes-exterior-450-water-based-topcoat-1-quart-flat)

## Best For

- general finishes enthusiasts

## Why This Product

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

## Key Features

- • **Rapid Drying Time:** Get back to your projects faster with a finish that’s ready to sand in just one hour under ideal conditions.
- • **Flexible & Durable:** Moves with wood better than traditional oil-based finishes, preventing cracks and extending the life of your exterior surfaces.
- • **UV Shielded Finish:** Protects your outdoor wood from harsh sunlight and fading, keeping your patio looking fresh season after season.
- • **Mildewcide Fortified:** Built-in protection against mold and fungus ensures your outdoor wood stays pristine and durable.
- • **Effortless Application & Cleanup:** Brush, spray, or roll on this water-based topcoat and clean up with just soap and water—no harsh chemicals needed.

## Overview

General Finishes Exterior 450 is a premium water-based topcoat designed for outdoor wood surfaces. Fortified with UV absorbers and mildewcides, it offers superior protection against sun damage and mold growth. Its fast drying time allows for quick recoating and sanding, while the water-based formula ensures easy application and cleanup. Ideal for patios, Adirondack chairs, and other exterior wood projects, it delivers a durable, flexible finish that resists cracking and yellowing, keeping your outdoor wood looking flawless longer.

## Description

GeneralFinishes Exterior 450 is fortified with UV absorbers to minimize fading andbuilt-in mildewcides to help retard the growth of mold and fungus. Plus, Exterior 450 is fast – ready to sand inone hour (under ideal conditions), which means you can be done finishingquickly. This Finish is ideal for an Adirondackchair, planter’s bench, trellis or something else for your porch or patio.

Review: Great Results but Requires Careful Application - In a front entry door application (white oak), I’m quite pleased with the results obtained with this GF Exterior 450 product. However, its application requires a bit more “technique” than other topcoat poly/urethane products produced by GF. Specifically, in brush applications the product goes on more like a shellac, rather than a typical water-based topcoat. That is, the product sets up so fast that it does not tolerate a lot of brush strokes (rework) over a newly wetted area. So, as with shellac, you want to avoid overloading your brush, then brush (wet) an area, and then keep the wetted area moving (expanding) by stroking subsequent brush loads into the previously wetted area. Don’t try to level brush strokes that appear in the wet product, as it self-levels beautifully upon drying. Also, if you see areas that appear cloudy white (likely due to too heavy of a coat) leave them alone, as they will dry clear. As well, even if you do mess up an area, in just a 2 – 3 hours it can be lightly sanded and easily recoated. Not to wear out the shellac analogy, but using a good quality medium soft nylon or natural bristle brush is essential for applying this fast-setting topcoat product. In retrospect, if you can use a HVLP spray outfit that’s likely a better choice over a brush application. For reference, I applied the product in near ideal ambient conditions (low humidity / <80F). All applied coats were thinned 8 - 10 percent with water. I did five light coats on the in-place door sanding out lightly (320 grit) only after coats 2 and 3. On bare white oak grain raising was minimal, and final results, in satin, produced a soft pleasing sheen with a rich honey oak appearance similar to an oil-based product. Exterior durability of a water-based product is an open question, but all GF products, in my experience, are of superior quality. So, I’ll take the leap that 450’s performance will be comparable to a good quality exterior varnish.
Review: Best out there - ocean salt and time said - This replaces other exterior poly-spar varnishes I've found. For 15 years, my place (a block from the Atlantic ocean and its salt air) always cracked oil based polyurethane finishes (the names sold in home centers). Tried this 450 product 5 years ago on my pine porch ceilings and mahogany railings. It was a pleasure to apply (it dries in less than an hour and thus I could get in 3-4 coats in a day). Probably near twice the price of some brands, but no question it's worth it when I don't have to recoat every six months anymore. No cracks in the finish by the next season - just beautiful wood. Recoat every two years and wood will last a very long time - no replacing railings and ceilings every 10 years. As most latex/water based coating products, it moves with the wood much better than oil poly. As the label says it will take more coats than a traditional polyurethane to get the build up that can protect wood well. If you share the opinion that painting isn't fun, nor turpentine paint cleanup or finish mess, you will find the soap-water cleanup nice. No I don't work for the company - I have just found that Mother Nature tells the truth as to what works outside - alot of other famous name products' tv advertising just does not hold up near water. It's an excellent product and the best solution to outdoor wood.

## Features

- Do not apply clear topcoats over bright white paint, as yellowing may occur due to a reaction to the substrate. Light color paints may also experience yellowing due to topcoat application, but it will less noticeable
- Exterior 450 Topcoat is fortified with UV absorbers to stabilize and protect the integrity of the finish but will not prevent the wood from changing color from sunlight
- Water based formula can be brushed, sprayed or rolled; soap and water cleanup

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | General Finishes |
| Color | Flat |
| Material | Water Based |
| Model Name | B093-L Quart |
| Size | 1 Quart |
| Surface Recommendation | Patio |

## Product Details

- **Color:** Flat
- **Brand:** General Finishes
- **Surface Recommendation:** Exterior surfaces (wood, metal, composite)
- **Material:** Water Based
- **Model Name:** B093-L Quart

## Images

![General Finishes Exterior 450 Water Based Topcoat, 1 Quart, Flat - Image 1](https://m.media-amazon.com/images/I/617X1KzoJKL.jpg)

## Available Options

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

## Questions & Answers

**Q: Does this block UV damage?**
A: Yes.  Rain exposure will however cause it to wear off, so use several coats (4 or 5).  You may have to sand/refinish annually, but this is likely going to be the case for all outdoor finishes.

**Q: I opened my can and it is white and as thick as yogurt.  Is this normal?**
A: Yep!... just make sure you stir it well.  My rule of thumb is 10 clockwise, 10 times counterclockwise, then repeat 10 times.  It will loosen up a little but remain white.  When you apply (if you apply smoothly and thinly) no white should be apparent.

**Q: This product is titled "flat quart", but the photo shows semi-gloss. Which finish is this product?**
A: Wow I missed that!  It's flat!

**Q: Can this be used on raw wood, stained wood and, painted surfaces all in the exterior application?**
A: I have used it on painted furniture and stained furniture outdoors. The front door and the swing both were covered but exposed to wind and rain only win storms blew it in. It’s a great product.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Results but Requires Careful Application
*by D***B on August 16, 2022*

In a front entry door application (white oak), I’m quite pleased with the results obtained with this GF Exterior 450 product. However, its application requires a bit more “technique” than other topcoat poly/urethane products produced by GF. Specifically, in brush applications the product goes on more like a shellac, rather than a typical water-based topcoat. That is, the product sets up so fast that it does not tolerate a lot of brush strokes (rework) over a newly wetted area. So, as with shellac, you want to avoid overloading your brush, then brush (wet) an area, and then keep the wetted area moving (expanding) by stroking subsequent brush loads into the previously wetted area. Don’t try to level brush strokes that appear in the wet product, as it self-levels beautifully upon drying. Also, if you see areas that appear cloudy white (likely due to too heavy of a coat) leave them alone, as they will dry clear. As well, even if you do mess up an area, in just a 2 – 3 hours it can be lightly sanded and easily recoated. Not to wear out the shellac analogy, but using a good quality medium soft nylon or natural bristle brush is essential for applying this fast-setting topcoat product. In retrospect, if you can use a HVLP spray outfit that’s likely a better choice over a brush application. For reference, I applied the product in near ideal ambient conditions (low humidity / <80F). All applied coats were thinned 8 - 10 percent with water. I did five light coats on the in-place door sanding out lightly (320 grit) only after coats 2 and 3. On bare white oak grain raising was minimal, and final results, in satin, produced a soft pleasing sheen with a rich honey oak appearance similar to an oil-based product. Exterior durability of a water-based product is an open question, but all GF products, in my experience, are of superior quality. So, I’ll take the leap that 450’s performance will be comparable to a good quality exterior varnish.

### ⭐⭐⭐⭐⭐ Best out there - ocean salt and time said
*by J***N on January 2, 2013*

This replaces other exterior poly-spar varnishes I've found. For 15 years, my place (a block from the Atlantic ocean and its salt air) always cracked oil based polyurethane finishes (the names sold in home centers). Tried this 450 product 5 years ago on my pine porch ceilings and mahogany railings. It was a pleasure to apply (it dries in less than an hour and thus I could get in 3-4 coats in a day). Probably near twice the price of some brands, but no question it's worth it when I don't have to recoat every six months anymore. No cracks in the finish by the next season - just beautiful wood. Recoat every two years and wood will last a very long time - no replacing railings and ceilings every 10 years. As most latex/water based coating products, it moves with the wood much better than oil poly. As the label says it will take more coats than a traditional polyurethane to get the build up that can protect wood well. If you share the opinion that painting isn't fun, nor turpentine paint cleanup or finish mess, you will find the soap-water cleanup nice. No I don't work for the company - I have just found that Mother Nature tells the truth as to what works outside - alot of other famous name products' tv advertising just does not hold up near water. It's an excellent product and the best solution to outdoor wood.

### ⭐⭐⭐⭐⭐ Beautiful satin sheen. Brings out and enhances the wood stain beauty.
*by S***D on August 11, 2023*

I refinished a front door after stripping and sanding three layers of tough and ugly paint. I had never tackled such a project before and I know I oversanded a few areas. I used General Finishes Chestnut stain which went on very well. This topcoat put the finishing touch on. I put 3 coats on and the result was a beautiful satin sheen on the door. I am so pleased. I would definitely use General Finishes products again. I used the remaining topcoat product to put a finish on an old coffee box shipping container. The topcoat brought out the wood grain and it looks nice enough to have in my kitchen. Definitely a quality product.

## Frequently Bought Together

- General Finishes Exterior 450 Water Based Topcoat, 1 Quart, Flat
- General Finishes Exterior 450 Water Based Wood Stain, 1 Quart, Black Walnut
- Pro Grade, Paint Brushes, 5-Piece, Paint Brush Set: Flat & Angle Brushes for Latex and Oil Paints, Stains, Interior & Exterior Home Improvement

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-02*