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Varnish

      Varnish provides radiant beauty to the wood and can be mixed with glaze to create various textures and patterns. It’s translucent and is mainly used for wood finishing. There are two types of varnishes: Oil varnish and Spirit varnish. The varnish conforming with IS: 347 should be used for finishing and under coat should be of approved brand and manufacturer. Generally ‘Copal’ varnish and superior spray varnish should be used. Airless paint sprayer is a good choice for various coatings spraying, high efficiency, finish surface, good quality.

      Surface Preparation for Varnish

      • All dust and dirt should be removed from the surface.
      • The cracks and holes should be cleaned of dust and be filled with wood putty.
      • The surfaces should be finished smooth with the help of carpenter’s plane.
      • Previous coats of paint or stain, if any, should be allowed to dry and be rubbed down lightly and washed off.
      • For exterior work, a normal dry day should be chosen because exposure to extreme heat, cold or damp atmosphere will spoil the work.
      • While applying varnish, care should be taken to avoid forming fume or air bubbles.

       wood painting by airless spray system

      Application of Varnish

      • Two or three coats of clear varnish should be applied for durable finish.
      • Next coat should be allowed when previous coat becomes dry.
      • The varnish should be applied with full brush and be spread evenly with short light strokes.
      • If the work is vertical, the varnish should be crossed and re-crossed and then laid off lightly.
      • It should be completed with upward brushing so that varnish could set, flow down and eliminate brush marks.
      • If the surface is horizontal, the varnish is worked in every direction with light quick strokes.
      • It should be finished in one definite direction so that it could set without showing brush marks.
      • The surface should be rubbed down after each coat with fine sand paper except final coat.
      • The finished surface should present an even look and fine glossy surface free from stripes, swelling, etc.

      compare without varnish and after varnish

      Varnishing Old Surfaces

      • If old varnished surface is solid, it should be cleaned of grease and dirt with turpentine oil and be rubbed with wet sand paper until the surface is clean and smooth.
      • It should be dried and be wiped clean with a soft cloth. If old surface is peeled off and cracked, it will be necessary to remove the entire varnish.

      Advantages of Varnish

      • Provides radiant beauty to the wood.
      • Helps in protecting the wood by binding the surface.
      • Helps to prevent hairline cracks and absorb the effects of scratching and external damage.
      • Helps in reducing the transfer of moisture between the wood and the surrounding weather.
      • Provides softness and lasting flexibility.

      Disadvantage of Varnish

      Becomes yellowish after a certain time.

      Tips are available:

      Orifice Size

      Fan Width – Inches

      Flow Rate

      Application

      Filter

          inch

      4” – 6” Fan

      6” – 8” Fan

      8” – 10” Fan

      10” – 12” Fan

      12” – 14” Fan

         gpm

         L/min

      0.011”

      211

      311

      411

      0.12

      0.45

      Stain or Lacquer

      150mesh (red)

      0.013”

      213

      313

      413

      513

      613

      0.18

      0.68

      0.015”

      215

      315

      415

      515

      615

      0.24

      0.91

      Oil Base Paint

      100mesh (yellow)

      0.017”

      217

      317

      417

      517

      617

      0.31

      1.17

      Latex Paint / Acrylic / Enamel

      100mesh

      0.019”

      219

      319

      419

      519

      619

      0.38

      1.44

      60mesh (white)

      0.021”

      321

      421

      521

      621

      0.47

      1.78

      0.023”

      323

      423

      523

      623

      0.57

      2.16

      Heavy latex

      60mesh (white)

      0.025”

      325

      425

      525

      625

      0.67

      2.54

      0.027”

      427

      527

      627

      0.77

      2.91

      0.029”

      429

      529

      629

      0.90

      3.41

      Elastomeric / Blockfiller / Primer /

      30mesh (green)

      0.031”

      431

      531

      631

      1.03

      3.90

      0.033”

      433

      533

      633

      1.17

      4.43

      Language in: French


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      • Comments

      1 comment

      1. Jaswinder
        2014/03/17 at 14:00:10

        Very informative and nice post on the topic.
        I am planning to do varnish to my all home doors.

        Thanks for the information.

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