Parex Finishes and coatings are designed for two functions: provide a decorative finish and to protect the wall surface against the elements: snow, sun, driving rain, freeze-thaw cycles, pollution, mildew and algae growth. Two of the most difficult problems to combat are the growth of fungi or mildew, and in some climates, algae. Fungi and algae will grow on any surface if the conditions are right and can lead to discoloration or marring of the coating's surface.

Algae are simple green plants that live in colonies. With exposure to sunlight, algae are able to produce most of their own nutrients through photosynthesis. Algae may appear as green, black or bluish stains, that without the aid of a microscope can easily be mistaken for fungi. One of the many ways that fungi differ from algae is that fungi must obtain all their nutrients directly from the substrate on which they grow. This includes wood and paint film. Unlike algae, most species of fungi have no requirement for sunshine, but can thrive in direct sunlight, in shade, or under the surface of algae colonies.

In some parts of the world algae growth is regarded as purely a cosmetic problem. Today, the effects of algae on a coated surface are recognized as the starting point for more serious problems that can challenge the finish coat. Algal colonies can retain moisture that can contribute to the proliferation of other organisms such as fungi, moss, and lichens.

The ability of algae to colonize on coatings varies with climatic zones. Generally, algal growth is more likely in warm, moist climates, although coatings intended for arid environments may need protection if exposed to excessive moisture from lawn sprinkler overspray. Heavy growth can occur under eaves, on the cooler side of buildings or any other place where the proper combination of sunlight and moisture exists.

The way coating companies deal with this in their formulation is to put some level of film-preserving biocide protectant in their products. The protectants will last for a period of time that is dependent upon environment, amount and quality of protectant used, the amount and quality of the polymer used in a given product, and the quality of the protectant. At Parex, our standard products have high levels of first-quality protectants effective against algae and mildew.

There are times when an owner or architect wants more protection against these two causes of stucco finish discolorants than is provided in normal Parex standard products, then “The Plus” Advantage can be used.

“The Plus” is an additional dosage of biocide protectant formulated at the manufacturing plant for a modest additional charge. “The Plus” dosage will increase the protectant by 75%, thereby significantly improving the resistance to fungi and algae growth. “The Plus” can be added to any Parex Coating or Finish.

“The Plus” is ideally used in areas that are subject to these growths. The above map provides a look at the areas most vulnerable to algae and fungal attack. Also, areas that have excess moisture are ideal for “The Plus”.

When “The Plus” is compared to “silicone” finish, there really is no comparison. Silicone enhanced finishes are blends of acrylic emulsion and silicone. The results are a change in the chemistry and performance. An all DPR (Dirt Pick-Up Resistant) acrylic finish is a film-forming protective finish that repels dirt accumulation. A silicone blended finish also provides a dirt repellent system. Some “silicone” finishes are even designed to have a chalking surface to provide them with a self cleaning effect that is really just slow deterioration. However, all Parex finishes, including Parex Siliconized finishes, are chalk-resistant.

Any dirt repellent system is beneficial because accumulated dirt encourages mildew and algae growth. But when it comes to protection against algae and fungi attack, ordinary silicone-enhanced finishes do not provide any better protection than standard Parex DPR finishes always have.

“The Plus” protection directly protects the coating film itself against algae and mildew growth by incorporating an EPA registered mildewcide / algaecide in the formula.

The answer is no, as previously mentioned, fungi and algae can grow on any surface if the conditions are right. “The Plus” uses the latest technology available to control the growth of both these problems. Periodic cleaning of surfaces may still be needed.

All Parex finishes include DPR (Dirt Pick-up Resistance) technology. This combined with “The Plus” technology gives Parex a finish that is truly a unique top-performing product. Consider the advantages:

• 100% Acrylic Polymer — UV-Resistant, Non-chalking, Non-yellowing
• DPR Technology — Looks better longer
• Highly Vapor Permeable — Drier wall cavities
• Highly Resistant to Algae and Fungi with 75% more protection — looks better longer
• Marble Aggregate — Finish does not rust, maintains colors
• Unlimited Color Options — More choices to match architectural palette

Available in most Parex finishes, siliconization additionally boosts dirt repellency. Parex Siliconized Finishes show exceptional resistance to excessive sunlight exposure as well as high humidity or acid rain in highly polluted areas.

Parex has combined new technologies into products that fit the market.s needs. By taking these proven formulations — DPR and “The Plus” — we are living up to our commitment to provide practical technology in solving potential problems.