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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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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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