Wood Finishing. What is wood finishing? Why do we finish wood? What are the steps to achieving a...
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Transcript of Wood Finishing. What is wood finishing? Why do we finish wood? What are the steps to achieving a...
Wood Finishing
Wood Finishing• What is wood finishing?• Why do we finish wood?• What are the steps to achieving a good finish?
Wood Finishing• Two steps to wood finishing– Sanding– Applying a chemical protectant (finish)
Sanding• Why do we sand the surface and edges:
• To remove machine marks• Smooth surface for good “feel”• Promote adhesion for finish
Sanding
• Removing Machine Marks
Sanding
• Making the wood “smooth”
80 Grit 120 Grit
Sanding
• Sanding should be done in at least three steps– 80 Grit (sub 100)– 150 Grit (sub 120)– 220 Grit (sub 180)
Abrasive Paper
40 gr, 80 gr, 150gr, 220 gr, 600gr
Sanding Tips
Sand with the grain
Don’t apply finish before 180 grit(see sander marks)
Don’t Quit too Soon (see machine marks)
Sanding Tips
• Raising the Grain– Final Step before applying finish– Raises the last tiny fibers so you can sand them off
Chemical Protectant• Wood is a porous absorbent material• Without finish it:– Discolors– Shrinks– Swells– Warps
Chemical Protectants• There are many different finishes, however
there is usually a “best” finish available for a given application.– Stain, Oil, Wax, Shellac, Varnish, Lacquer, Paint,
Enamel, Epoxy and Polyester Resin, and Water-Based Finishes (low VOC)
– Applying Finish