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Posts tagged ‘coatings’

Coating Tips for Warranty-Covered Surfaces and Products

I was tempted. A friend wanted me to “change the surface color” of one section of exterior siding bordering a new wood deck and spa.  No thanks! The siding was under a 15-year warranty.


Another friend wanted me to paint over the clear glass on each of his security system units.I thought about, even experimented by, custom mixing, then painting on a similar piece of glass.

Final advice: I wouldn’t advise it. The security system and units were under warranty.


Cardinal rule: Never paint the surface of any pre-finished product under warranty.

Examples: Exterior siding, security lighting systems, woods, metals, certain roofing, appliances.



  1. Always apply coatings or finishes according to manufacturer’s recommendations.


  1. Always provide the proper surface preparation.


  1. Do not apply a finish on an unstable surface. Examples: Hot, cold, too rough.


  1. Do not apply finishes over incompatible coatings. Result: Early paint failures.


  1. Make sure the primer and finish combinations are compatible.


  1. Do not use paint to alter a product, which at some time you may need or want to return.



Coating warranty-covered surfaces and products calls for special vigilance, and a keen eye.


Thank you for visiting “Painting with Bob.”


Copyright 2016. Robert D. Hajtovik. All rights reserved.

Painting It: Which Way is Best? Part 2: Finish Affordability and Application

Part 2 of “Painting It: Which Way is Best?”


Affordability and application relate directly to the suitability, quality and durability of the products you choose. Together – along with surface types, exposures, conditions, and finish life, they ensure a final finish that meets your needs. And, keeps everyone happy, hopefully.




The more specialized the paint or coating, the more it will cost. Component paints may have activator, catalyst, hardener and a specialized solvent as part of the package. Examples: Industrial coatings and automotive finishes.

A wide range of residential and commercial paints, coatings and finishes is available. They vary in cost and durability. Sherwin-Williams offers one of the widest selections of products, that cover the greatest number of applications. Their prices run the gamut of affordability.

KEEP IN MIND: Often, cost equates with quality.




Painting methods include: Brushing, rolling, spray finishing and decorative painting. The type of surface, paint product and level of productivity desired will determine which is best to use.

Read: “Painting with Bob” posts about each of these application methods.



1. Most brush types can be used to apply a variety of coatings. The same holds true for roller covers. Hint: Paints/coatings must have the same basic solvent type.

A. China bristles: Apply oil paint, oil stains, varnishes, polyurethanes, epoxies, etc.

B. Nylon/polyester bristles: Apply water-based products.

2. Roller covers are composed of a variety of fibers. Each has its specific use. Make sure the fibers are compatible with the solvent in the paint.

A. Nylon/polyester: Apply latexes, oils, polyurethanes, alkyds, epoxies, etc.

B. Wool: Apply same as above. Clean covers on a daily basis. Do not leave covered in paint.

C. Mohair: Apply oils, varnishes, polyurethanes, clear finishes.

D. Foam: Apply varnishes, polyurethanes, latexes, oils and alkyds. For ultra smooth finishes.



Spray finishing equipment can apply greater volumes of product than other methods. Three fundamental types of spray systems are used.

1. Conventional System: Utilizes a spray gun, paint pressure tank, and compressed air supply to atomize the paint into a workable spray pattern.

2. Airless System: Utilizes hydraulics to apply high pressure to paint supply, delivered to spray gun, becoming atomized much like Conventional System. This system increases considerably the level of production.

3. Electrostatic System: Utilizes electrolytic charging controller and atomization spray gun. It charges paint molecules with electrons, resulting in a magnetic attraction between the surface and the paint material. It is designed for extremely fine finishing and works only on metal applications.  



1. Thoroughly prepare surfaces by cleaning, patching, caulking, sanding and paint removal.

2. Carefully protect all surfaces and areas not to be painted.

3. Promptly prime all bare and specially prepared areas.

4. Apply finish paint uniformly to cover existing surface.

5. The final product may require several coats of paint to achieve the desired results.

Below is a listing of the various paint types and their applications.



1. Waterborne Materials.

A. Products: Latexes, latex enamel, acrylic latex enamel, acrylic latex, water-base stain, acrylic clear coat, waterborne epoxy, acrylic glaze.

B. Specific Uses – Interior/Exterior: Drywall, plaster, Masonry – Block, brick, concrete; Wood – Doors, molding, windows, structural limber; Metal – When appropriate primer is applied first.

2. Mineral Spirits Materials.

A. Products: Oil, Alkyds, varnish, polyurethane, stains.

B. Specific Uses – Interior/Exterior: Same as above, especially when greater resistance to moisture and UV rays is desired. Oil paint is suited ideally for metal painting.

3. Catalyzed Materials.

A. Products: Epoxy, urethane, polyurethane, organic primers.

B. Specific uses – Interior/Exterior: Same as with waterborne materials. These materials are designed especially for use on metals, where a high degree of chemical and corrosion resistance and UV protection from the sun is desired. They are the most durable paint finishes available.

4. Alcohol Materials.  

A. Products: Shellacs, primers.

B. Specific uses – Interior/Exterior: These materials are applied as a protective clear finish or a specialized prime. Where: Surface adherence is a question; or as a sealant of surface marks and stains before finish painting.


Food for Thought:

Whether you are the painter, chief of engineering/facility services, or general manager, consider all of the factors when deciding which is best for any painting or finishing project.

The quality and durability of the final result tends to equate with what was best for the (1) surface; (2) painter/finisher; (3)  department’s operations; (4) management’s bottom line; (5) business; and, especially, (6) guests, visitors, and customers.

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Thank you for visiting “Painting with Bob.”

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Copyright 2015. Robert D. Hajtovik. All rights reserved.

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