What Color Medic Does and How It Works with Pressure Washers

Color Medic restores faded exterior paint and stain without stripping or sanding

Color Medic is a chemical treatment applied with a pressure washer that revives the color of faded wood siding, decks, fences, and painted surfaces. It does not remove the existing finish—instead, it penetrates the surface layer to restore depth and vibrancy to wood stain or exterior paint that has dulled from sun exposure and weathering. The product works by oxidation reversal, meaning it addresses the chemical breakdown that makes surfaces look gray and lifeless.

The treatment is most effective on wood that has faded but remains structurally sound. If your deck or siding looks washed out after a few years in the sun, Color Medic can make it look newly stained or painted without the cost and labor of a full refinish. The process takes a few hours and requires no sanding, stripping, or primer.

Color Medic is not a stain or paint. It is a restoration product that works best as a maintenance step between full refinishes, typically extending the life of your existing finish by several years. It will not hide deep stains, mold, or structural damage—those issues need to be addressed separately before treatment.

Key Takeaways

• Color Medic restores faded wood color by reversing oxidation, making surfaces look newly stained without stripping or sanding.
• The product works on wood siding, decks, fences, and painted surfaces that have faded from sun and weather but are not damaged or moldy.
• Application requires a pressure washer and takes several hours; the surface must dry completely before you can walk on it or apply a topcoat.
• Results typically last three to five years before the surface begins to fade again, making it a maintenance step rather than a permanent solution.
• Deep stains, mold, rot, and peeling paint must be cleaned or repaired before Color Medic is applied, or the treatment will not work properly.

How Color Medic is applied with a pressure washer

The process begins with pressure washing the surface to remove dirt, algae, and loose debris. Use a lower pressure setting (around 1500 to 2000 PSI) to avoid damaging the wood. Once the surface is clean and dry—usually 24 to 48 hours after washing—you apply Color Medic according to the product instructions, typically by spraying it on with a pump sprayer or low-pressure nozzle on the washer.

The chemical sits on the wood for a set time (usually 15 to 30 minutes, depending on the product brand) while it works to reverse oxidation. During this time, you may need to keep the surface wet by misting it lightly. After the dwell time, you rinse the product off with the pressure washer at low pressure, working from top to bottom to avoid streaking.

The entire process—washing, applying Color Medic, waiting, and rinsing—typically takes four to six hours for a deck or large fence section. The surface must then dry completely (24 to 48 hours) before foot traffic or applying a topcoat sealer. Applying a sealer after Color Medic treatment helps lock in the restored color and extends the results.

When Color Medic will and will not work

Color Medic works best on wood that has faded evenly and has no structural problems. If your deck or siding is simply gray and dull from sun exposure, Color Medic can restore it to look like freshly stained wood. It also works on painted surfaces that have faded but are not peeling or chalking.

Color Medic will not work if the surface has mold, mildew, deep stains, or significant dirt buildup—these must be cleaned away first. It cannot repair peeling paint, splintered wood, or rot. If your wood is soft to the touch, has visible damage, or shows signs of decay, those areas need repair or replacement before Color Medic is applied. Applying Color Medic over damaged wood will not fix the underlying problem and will waste the product.

The product also works better on some wood species than others. Cedar, redwood, and pressure-treated pine typically respond well. Exotic hardwoods or heavily weathered wood may show less dramatic results. Test the product on a small, inconspicuous area first to see how your specific surface will respond.

Cost and how long results last

Color Medic costs vary by brand and quantity, but a gallon typically runs between $30 and $60 and covers roughly 200 to 400 square feet, depending on the wood's porosity and the product concentration. For a 400-square-foot deck, you might spend $50 to $150 on the product itself, plus the cost of any sealer you apply afterward. This is significantly less than the cost of sanding, staining, and sealing a deck, which can run into the hundreds or thousands of dollars.

Results from Color Medic typically last three to five years before fading begins again. The timeline depends on sun exposure, weather, and whether you applied a protective sealer. Decks and siding facing south or west (high sun exposure) fade faster than those on the north side of a building. Regular maintenance—cleaning annually and resealing every two to three years—extends the life of the Color Medic treatment.

Preparing your surface before treatment

Proper preparation is critical for Color Medic to work. Start by pressure washing the entire surface at 1500 to 2000 PSI to remove dirt, algae, and loose paint or stain. Pay special attention to corners, crevices, and areas where mold or mildew tends to grow. If you see dark stains or mold that washing does not remove, use a deck cleaner or mold-killing solution before pressure washing again.

Once the surface is clean, inspect it carefully for damage. Look for soft spots, splintering, peeling paint, or areas where the wood feels spongy. These must be repaired or sanded smooth before Color Medic is applied. If the surface is rough or splintered, a light sanding (80 to 120 grit) can help the product penetrate evenly and improve the final appearance.

Allow the surface to dry completely—at least 24 to 48 hours in dry weather—before applying Color Medic. Wet or damp wood will not absorb the product properly, and results will be uneven. Check the weather forecast before starting; rain within 24 hours of application can wash away the product or prevent it from setting correctly.

Sealing after Color Medic treatment

Applying a sealer after Color Medic is optional but strongly recommended. A sealer protects the restored color from fading and extends the life of the treatment by several years. Water-based polyurethane, oil-based sealers, and deck stains all work over Color Medic, as long as the surface is clean and dry before application.

Wait at least 24 to 48 hours after rinsing Color Medic before applying a sealer, and follow the sealer manufacturer's instructions for drying time and recoat windows. Some sealers require a second coat; others do not. A quality sealer can add $50 to $200 to the total cost but can extend the life of your Color Medic treatment from three to five years to five to seven years or longer.

Alternatives to Color Medic

If Color Medic does not suit your situation, other options exist. A full refinish—sanding, staining, and sealing—gives you complete control over the final color and provides the longest-lasting results, typically seven to ten years or more. However, this approach is labor-intensive and costly, especially for large decks or siding.

Deck stain or exterior paint applied directly over faded surfaces (after cleaning) is another route, though results may be uneven if the underlying finish is not uniform. Some homeowners simply pressure wash and reseal without Color Medic, which maintains the current color but does not restore faded areas. For surfaces with significant damage, repair or replacement of affected boards may be necessary before any cosmetic treatment is considered.

Frequently Asked Questions

Can I apply Color Medic to a deck that is still wet?

No. The surface must be completely dry—typically 24 to 48 hours after pressure washing—for Color Medic to penetrate and work properly. Applying it to damp wood results in uneven color restoration and wasted product. Check the wood with a moisture meter if you are unsure; most products require moisture content below 20 percent.

Will Color Medic work on painted surfaces?

Yes, Color Medic can restore faded paint, but only if the paint is not peeling, chalking, or flaking. If the paint is in poor condition, it must be scraped, sanded, or stripped before Color Medic is applied. On sound painted surfaces, Color Medic can revive the color and extend the life of the paint by a few years.

How often do I need to reapply Color Medic?

Most treatments last three to five years before fading begins again. The timeline depends on sun exposure and weather. If you apply a sealer after Color Medic, results can extend to five to seven years. Annual cleaning and resealing every two to three years help maintain the restored color longer.

Can Color Medic fix mold or mildew stains?

No. Mold and mildew must be removed before Color Medic is applied. Use a pressure washer with a mold-killing cleaner or a dedicated deck cleaner to eliminate these problems first. Applying Color Medic over mold will not work and may trap moisture, making the problem worse.

What is the difference between Color Medic and wood stain?

Color Medic restores the color of existing stain or paint by reversing oxidation; it does not change the color or add a new layer. Wood stain is a new finish that covers the surface and can change the color completely. Stain requires sanding or stripping the old finish first, while Color Medic does not.