Three difficult exterior issues that affect paint appearance and longevity are all caused by excessive moisture. Minimizing the moisture problem first and then renewing the substrate with quality Diamond Vogel paints is the key to success.
Mildew is an unsightly fungus that can grow on many surfaces including paint. The mildew feeds on nutrients available in both the paint film and the underlying surface. Most important for mildew growth is moisture, so it is commonly found in damp, dark places frequently under eaves and behind shrubbery.
Mildew must be removed prior to painting. Mix one part of bleach with three parts of water. Scrub the area thoroughly while protecting yourself by wearing rubber gloves, eye protection and other protective clothing. Don’t allow the bleach/water mixture to dry out on the surface. Rinse the area thoroughly and allow the area to dry. Repaint the area as soon as possible. We recommend two coats of Diamond Vogel's Permacryl Exterior, Weather-Plate, or EverCryl Acrylic Latex.
Allowing more sunlight and better air movement to reach the affected area will help minimize the return of the mildew, so pruning trees and thinning shrubbery are important steps.
Tannin is a naturally occurring, water soluble substance found in many varieties of wood. Tannin can be pulled to the surface in the presence of water and leaves behind a brown or tan stain. Tannin staining issues are more likely to develop from red cedar, cypress and redwood. While these stains do not harm the integrity of the paint film, they are unsightly.
单宁是一种天然存在的水溶性物质，可以在许多种木材中找到。 单宁可以在水面上拉到表面，留下棕色或棕褐色的污迹。 单宁染色问题更可能由红柏，柏树和红木发展而来。 虽然这些污渍不会损害漆膜的完整性，但它们不美观。
The best way of preventing tannin staining is by applying a tight film of paint over the substrate minimizing the ability of water to penetrate. In the past, solvent-based alkyd primers were the choice to prevent tanning staining. However, solvent-based primers tend to become brittle, crack and peel with age.
防止单宁染色的最好方法是在底材上涂上一层紧密的油漆，最大限度地降低水渗透的能力。 在过去，溶剂型醇酸底漆是防止鞣制染色的选择。 然而，溶剂型底漆会随着时间的推移而变脆，开裂和剥落。
Diamond Vogel developed Sure Grip Exterior Acrylic Latex Primer to combat tannin staining and peeling issues on exterior wood substrates. Sure Grip applied in two coats with twenty-four hours in-between coats, does an amazing job preventing tannin bleeding. Topcoat with Permacryl Exterior, Weather-Plate, or EverCryl Acrylic Latex for a long lasting, beautiful paint job.
Efflorescence is a white or tannish, powdery deposit on concrete or masonry substrates. While typically not structurally damaging to the substrate, it is unsightly and destroys the paint on the substrate. Efflorescence occurs when moisture migrates through concrete and masonry substrates, dissolving salts contained in the material. The moisture deposits the salts on the surface of the substrate and evaporates, leaving the powdery deposit.
在混凝土或砖石基材上，花序是白色或者浅褐色的粉末状沉积物。 虽然通常不会在结构上损坏基材，但是不美观且破坏基材上的油漆。 当水分通过混凝土和砖石基质迁移时，会发生风化，溶解材料中包含的盐分。 水分将盐沉积在基材表面并蒸发，留下粉末状沉积物。
Prior to rectifying the ruined painted surface, the source of the moisture must be found and stopped, or the process will reoccur. Once the moisture has been stopped, remove the existing efflorescence and loose paint by using a stiff wire brush. Clean the surface to remove all the dirt, debris and other contamination. Prime the surface with either Diamond Vogel's Weather-Plate Exterior Acrylic Latex Primer or Sure Grip Exterior Acrylic Latex Primer, followed with your favorite color in either Diamond Vogel's Permacryl Exterior, Weather-Plate, or EverCryl Acrylic Latex.
在纠正被破坏的油漆表面之前，必须找到并停止水分的来源，否则过程将再次发生。 一旦湿气停止，使用硬钢丝刷去除现有的风化和松散的油漆。 清洁表面以去除所有的灰尘，碎屑和其他污染物。 使用外部丙烯酸乳胶底漆或外部丙烯酸乳胶底漆，使用您最喜爱的颜色。