Furniture

Stain/Paints

Exterior 450

Exterior 450 Topcoat a clear-drying finish suitable for vertical exterior surfaces, such as fences, patio furniture, garage doors, entrance doors and interior windows. It is not recommended as a deck finish. Exterior 450 is fortified with UV absorbers to stabilize the finish and built-in mildewcide to retard mold and mildew growth. It performs well as a clear coat or as an optional topcoat over General Finishes Milk Paint. 

<-- Data Exterior

<--Professional Enduro Catalog

<--Safety Data Sheet Exterior 450

<--Performance Data Exterior

Exterior 450 Variations

  • SATIN

  • GLOSS

  • FLAT

  • SEMI-GLOSS

All wood projects require preparation sanding. If you skip this critical step, your finish may fail.

Preparation for Raw Wood Projects
See our video: How to Prep Sand Raw Wood

  1. 120-grit sandpaper followed by 150-grit or 220-grit sandpaper. Do not over-sand with fine-grit sandpapers; this will close and seal the wood grain, preventing ideal color absorption. Also, do NOT use steel wool on water-based based finishes; the particles will get trapped in the finish and rust.

  2. Remove dust with a water-dampened rag or oil-free tack cloth.

  3. Let dry completely before applying General Finishes Exterior 450.

  1. Stir topcoat to reincorporate solids that have settled to the bottom of the can before and throughout the application process.

  2. If desired, thin with 10-15% distilled water or General Finishes Extender. The extender will improve flow and leveling and increase open time, which is helpful in dry climates.

  3. Apply 3 coats of Exterior 450. More coats will not improve durability.

    • Hand application: Apply a liberal amount of product using an acrylic bristle brush, foam brush, pad applicator or roller. Avoid pressure and excessive back-brushing. Brush along the wood grain using smooth, even strokes with light lap marks. Let lap marks dry; they WILL tighten down.

    • Spray application: Before spraying, strain topcoat through a fine-mesh filter. HVLP: 1.1mm-1.3mm spray tip, medium air cap. Verify tip sizes with your equipment supplier. Keep your gun at a 90* angle, 6-8" from the surface. On large, flat areas, use wet, even patterns 6-8" wide. For narrow surfaces, reduce the fan pattern to 2-3" wide to reduce overspray. Overlap each pass 25% to conceal lines. Wear a full filter respirator (NIOSH/MSHA approved) and work in a ventilated space. Visit this FAQ for more information on spraying techniques.

  4. Dry 2+ hours between coats in ideal conditions: 70*F/20*C; 50-70% humidity. Be sure to allow adequate dry time. You can tell if a water-based finish is dry if it forms a powder when lightly sanded with a fine-grade (220-320) foam sanding pad or 400-grit sandpaper. If in doubt, wait longer. Rushing the dry time can cause "blush," which is clouding in the finish due to moisture trapped between the layers. Increase dry time if:

    • Humidity is over 80%

    • 3+ coats are applied

    • Thick coats are applied

    • To accelerate dry time in humid conditions, add General Finishes Accelerator and work in a space with good ventilation and air movement. If you decide to re-coat before the recommended time, test dryness.

  5. Finish sand between coats with a fine-grade (220-320) foam sanding pad or 400-grit sandpaper to improve smoothness and adhesion.

  6. Remove dust with a vacuum, oil-free tack cloth or clean, water-dampened rag before re-coating.

  7.  

Cure Time
Water-based finishes cure and harden for full use after 21 days in ideal conditions. Avoid placing heavy objects on surfaces that have not completely cured. Treat gently, and do not clean with commercial products during the curing period.

 

WARNING: We do not recommend Exterior 450 stains or topcoats for exotic woods, ipe, teak or other dense, oily woods. 

 

NOTE: Exterior 450 is designed to let the water permeate the finish; as it dries, the water releases back out to allow the finish to tighten down again. Temporary cloudiness may occur as the finish dries.

Cure First
Allow 21 days for the finish to cure before heavy use or cleaning with commercial products.

Regular Cleaning and Maintenance

  • Remove dust with a water-dampened cloth. Dust can build up over time and may scratch or dull finishes if not removed regularly. 

  • As with all furniture finishes, avoid using furniture polish, cleaners or dusting sprays that contain silicone, alcohol, ammonia and anything acidic. Future finishes or touch-ups may not adhere properly or perform as desired over a contaminated surface. Some contaminants, such as silicone, seep through finish into the wood and often cannot be removed.

  • Clean up water, alcohol and food spills in a timely manner and use placemats & coasters to protect the finish.

Limited Warranty

General Finishes products must be tested to your complete satisfaction before using, including compatibility with other manufacturers products. General Finishes will be responsible only for the cost of our products and will not be responsible for any costs such as labor, damage, or replacement costs.

Warning

If you scrape, sand, or remove old paint, you may release lead dust. LEAD IS TOXIC. EXPOSURE TO LEAD DUST CAN CAUSE SERIOUS ILLNESS, SUCH AS BRAIN DAMAGE, ESPECIALLY IN CHILDREN. PREGNANT WOMEN SHOULD ALSO AVOID EXPOSURE. Wear a NIOSH-approved respirator to control lead exposure. Clean up carefully with a HEPA vacuum and a wet mop. Before you start, find out how to protect yourself and your family by contacting the National Lead Information Hotline at 1-800-424-LEAD or log ontowww.epa.gov/lead.WARNING: This product contains a chemical known to the State of California to cause cancer and birth defects. Do not swallow; first aid: drink water to dilute product. May cause eye and skin irritation; first aid: flush eyes thoroughly with water. This product contains a chemical know to the State of California to cause cancer and birth defects. Chemicals that also are included in all the products of General Finishes Company.

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