cedar clear coat

Tips on Finishing Western Red Cedar Outdoor Applications

How đồ sộ Apply Finishing đồ sộ Real Cedar

Fenlon House clear cedar siding front entranceHow a finish is applied đồ sộ cedar is as important for durability and good performance as is the finish-substrate combination chosen for the job. Finishes can be brushed, rolled, sprayed or applied by dipping. The application technique, the quality and quantity of finish applied, the surface condition of the substrate, and the weather conditions at the time of application can substantially influence the life expectancy of the finish. The application guidelines suggested here should be followed in concert with the manufacturer’s directions for the product.


Paints of all types such as vinyl-acrylic, modified-acrylic, and oil-based top coats are all suitable for cedar but test results show that good-quality 100%-acrylic formulations perform best. To achieve maximum paint life, follow these steps:

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  1. On bare new or restored cedar, apply one coat only of water-repellent preservative (1% or less of wax by volume and content). Allow it đồ sộ dry for the period of time recommended by the manufacturer. If the wood has been dip treated, a longer drying time may be needed. Do not paint before the solvent from the water-repellent preservative has evaporated because the paint may then be slow đồ sộ dry, may discolor, or dry with a rough surface.
  2. Apply a good quality stain-blocking primer as soon as possible after the water-repellent has dried. The primer coat is very important because it forms a base for all succeeding paint coats and should be used whether the top coat is oil-based or latex-based. Application rates recommended by the manufacturer should be followed.
  3. Apply the top coat over the primer. If two top coats are đồ sộ be applied, allow the first đồ sộ cure for the period recommended by the manufacturer before applying the second. In cold or damp weather, allow extra time between coats.

Water-Repellent Preservatives

Water-repellent preservatives should be used only on newly manufactured bare cedar, on restored bare cedar, or on cedar previously treated with the same type of product. Application of preservative by brush, pad, or roller followed by thorough back-brushing is equally effective. When cedar is treated after the structure has been completed, liberal amounts of the solution should be applied đồ sộ all lap and butt joints, edges and ends of boards. Other areas vulnerable đồ sộ moisture penetration, such as below doors and window frames, also need đồ sộ be treated.

When used as a natural finish, the service life of a water-repellent is only one đồ sộ two years depending upon the wood and the exposure. Treatments on textured surfaces generally last longer than thở those on smooth surfaces. Dip treatment prior đồ sộ installation or repeated brush treatment đồ sộ the point of refusal will enhance the finish durability. The more finish absorbed by the wood, the longer the service life. If a water-repellent preservative is used as a pre-treatment before painting, apply only a single coat, and use caution đồ sộ avoid excessive build-up.

Semi-Transparent, Oil-Based Penetrating Stains

Semi-transparent, oil-based penetrating stains may be applied by brush, spray, pad, or roller. Brushing will usually give the best penetration and performance. Spray or roller application followed by back-brushing is also an acceptable method of application. These oil-based stains are generally thin and runny, ví application can be messy. Lap marks can be prevented by staining continuous lengths. This method prevents the front edge of the stained area from drying before a logical stopping place is reached. Working in the shade is desirable because the drying rate is slower. Stain that has been applied by spray without back-brushing is particularly prone đồ sộ show blotchy patterns as it weathers.

Two coats of penetrating oil-based stain on textured cedar will provide longer service life than thở one coat, but only if the wood will accept the second coat. Stir the stain thoroughly during application đồ sộ prevent settling and color change. Avoid mixing different brands or batches of stain.

Latex semi-transparent stains vì thế not penetrate the wood surface, but they are easy đồ sộ apply and less likely đồ sộ size lap marks. These stains are film-forming and are not as durable as oil-based stains.

Solid-Color Stains

Solid-color stains may be applied đồ sộ cedar by brush, roller, or pad. Brush application is usually the best. These stains act much lượt thích paint. One coat of solid-color stain is only marginally adequate on new wood. A prime coat with a top coat will always provide better protection and longer service. The best performance can be obtained if the wood is primed, then given two coats of stain. Top coats of 100% acrylic latex solid-color stains are generally superior đồ sộ all others, especially when two coats are applied over a primer.

Unlike paint, a solid-color stain may leave lap marks. To prevent lap marks, follow the procedures suggested for semi-transparent penetrating stains.

Opaque Finishes


Painted Board and Batten Cedar SidingPaint provides the most surface protection against weathering and wetting by water while providing color and concealing some of the wood’s characteristics. Although paint can reduce wood’s absorption of water, paint itself is not a preservative.

Alkyd-oil based primers usually offer the best shield against discoloration by water-soluble extractives. Latex paint, particularly 100% acrylic formulations, remain more flexible with age and are better able đồ sộ accommodate dimensional changes by stretching and shrinking with the wood.

Solid-Color Stains

Solid-color stains are opaque finishes with fewer solids than thở paint. Available in a wide spectrum of hues, solid-color stains obscure the woods true color but allow some of the natural characteristics and texture of cedar đồ sộ remain. Solid-color stains perform best on textured surfaces. They are non-penetrating and, lượt thích paints, size a film. A stain-blocking primer should be applied first, followed by a 100% acrylic latex-based top coat.

Natural Finishes


Outdoor Modern House With Family Cedar Siding Water-repellents and water-repellent preservatives may be applied đồ sộ cedar used above ground. These formulations reduce water absorption in the short term. The addition of a fungicide that inhibits the growth of mildew and decay fungi will further increase wood’s durability.

A low-wax-content water-repellent preservative applied đồ sộ newly-milled cedar as a single-coat pre-treatment before painting may help reduce discoloration caused by bleeding of water-soluble extractives.

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Semi-Transparent Stains

Semi-transparent stains may be latex or oil-based. The semi-transparent nature of the stain, due đồ sộ its low solids nội dung, does not block all ultraviolet radiation and some will reach the wood’s surface. Latex stains vì thế not penetrate the surface and are not as durable.


Transparent, non-flexible, film-forming finishes such as lacquer, shellac, urethane, and varnish are not recommended for exterior use on cedar. Ultraviolet radiation can penetrate the transparent film and degrade the wood. Regardless of the number of coats, the finish will eventually become brittle, develop severe cracks and then fail.


Cedar Discoloration

Cedar enjoys a well-deserved reputation as a wood that takes and holds a range of finishes for extended periods. Nevertheless, the normal life of a finish will be shortened by degradation and discoloration. The causes of degradation are many and have been discussed in the preceding pages.

The causes of discoloration, though not in themselves a failure of the finish, often requires remedial treatment.


Dirt is the most benign cause of discoloration and not usually a problem. A periodic cleaning with a mild detergent solution will usually restore the surface finish.


Mildew applies both đồ sộ the fungus and đồ sộ its staining effects on both the finish and the wood. Mildew is a common cause of discoloration of paint, solid-color stains and natural finishes. Restaining does not solve a mildew problem. When it is time đồ sộ refinish, clean off the mildew with a commercial mildew-remover then refinish with a coating that contains an effective mildewcide.

Extractives Bleed

Extractives bleed that discolor the finish is usually caused by moisture. To stop stains caused by extractives bleed, moisture problems must be eliminated. Mild staining is often washed away by rain over a period of weeks. In sheltered areas of the building where the stain persists, it may become darker with age and more difficult đồ sộ remove. If washing with a mild detergent solution does not work, a commercial cleaner may help.

Iron Stains

Iron stains may appear in two forms: the reddish brown discoloration caused by rust, and blue-black discoloration caused by the reaction of iron from nails and other metal objects with extractives from the cedar. To prevent these stains, use only hot-dipped galvanized, aluminum or stainless steel nails when fastening cedar.

Water Stains

Water stains often occur in combination with extractive bleed and mildew growth. These stains can be difficult đồ sộ remove. Scrubbing the wood with an oxalic acid solution is sometimes effective.

Caution: Handle oxalic acid solution with care as it can be harmful.


Chalking is a property of the paint, not the cedar. It occurs when a paint film weathers or deteriorates, releasing pigment particles that act lượt thích a fine powder on the paint surface. Chalking is a common cause of fading of tinted or colored paints.

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Factory Finish

Exterior Finishes for Siding and Trim Factory Finishing/Priming

For optimum performance, the WRCLA recommends that Western Red Cedar is pre-primed or pre-finished prior đồ sộ job site delivery. Factory-priming, as the name implies, is performed in an industrial setting where a machine coating process applies a coating đồ sộ all six sides of each board. The coated boards are then dried prior đồ sộ shipment đồ sộ the job sites. Pre-primed siding and trim boards delivered đồ sộ a job site should be kept dry and clean prior đồ sộ installation. All field cuts should be re-sealed with a primer prior đồ sộ the boards being installed. Top coating should be completed as quickly as possible as most primers are not intended đồ sộ be exposed đồ sộ natural weathering for more than thở 90 days.

Factory–finishing is similar đồ sộ the above process, however, it allows for the additional application of one or two topcoats of acrylic latex paint, solid stains or natural stains in job lot quantities and in the colors selected by the builder/homeowner. It is important not đồ sộ overdrive nails during installation of factory finished siding, as this will damage the surrounding wood and coating. Overdriven nails must be remedied immediately by filling the depression with exterior grade wood putty specifically designed for this purpose.

Touch-up any repairs or field cuts, taking care not đồ sộ smear the top coat.  Properly done, factory priming/finishing provides:

  • the application of a uniform coating at the recommended coverage of the primer/stain đồ sộ all six surfaces of each piece (face, back, edges andends)
  • a controlled environment đồ sộ permit proper curing of the finish
  • the wood with a coating đồ sộ protect it from exposure đồ sộ sunlight (UV degradation) and surface contamination by mildew and dirt
  • an elimination of lap marks, streaks and shrink lines after installation • an ability đồ sộ install products at any time of the year
  • a product that often comes with a coating warranty