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3 Steps to Match a Stainless Steel Satin (#4) Finish

3 Steps to Match a Stainless Steel Satin (#4) Finish

Posted on Thursday, 11 April 2019 by Julian Prestidge
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A #4 satin finish is one of the most commonly used finishes. It's ideal for fabrications that need to look great, without being too reflective. What's more, its relatively easy to achieve - keep reading to learn how...

What is a satin finish?

A satin finish, also called #4 finish, is a brushed finish which can often differ in appearance from batch to batch due to manufacturing variations. The satin appearance is characterised by a pattern of very fine parallel lines, producing a decorative appearance which is not too reflective.

The #4 brushed finish is used on stainless steel applications where appearance is important, but reflectiveness is unwanted. For example, kitchen benchtops, hand rails, architecture or automotives.

As a satin finish is created by creating fine scratches in the stainless steel, this does make it slightly less corrosion resistant than a mirror finish as the groves are susceptible to rust.

#3 is also a brushed finish, but has a much more grainy look, with thicker parallel scratch marks, as seen in the image to the right.

Pros

Cons

  •  Strong decorative appeal
  • Is not highly reflective
  • Easier to match during fabrication than 2B or mirror finishes
  •  Reduced corrosion resistance
  • Can differ in appearance from batch to batch

 

3 steps to match a #4 Satin Finish on Stainless Steel

With a bit of practice, skill and the right tools it can be done! Here's a step-by-step guide:

What you'll need:

 
Deerfos Bora9 Fibre Disc, 60 grit+
ELITE Flap Wheel (available in wooden hub or spindle mount) or Portable File Belt - 60 grit+
Deerfos SA331 Velcro Sanding Discs
Combination Flap Wheel (available in wooden hub or spindle mount)

 

Step 1. Level the weld

Using a Deerfos Bora9 Fibre Disc, 60 grit+, carefully remove the weld without gauging or distorting the work.

Bora9 Fibre Discs use a new generation ceramic grain for aggressive, cool cutting and long life caused by the sharp crystal shaped grain. They also utilise a specialised top coating to reduce clogging, friction and heat build up, maintaining the sharpness of the grain.


 
 Deerfos Bora9 Fibre Disc, 60 grit+

Step 2. Sanding out the defects

There's 2 options for sanding out the defects depending on how large the area is that needs blending:

Option 1: Small area
  • Set the grain with an ELITE Flap Wheel (available in wooden hub or spindle mount) or a Portable File Belt - 60 grit+, moving your sander front-to-back, rather than side-to-side. You'll want to stay as close to the welded area as possible to minimise the final blending.
  • Repeat sanding step above, but this time using 120 grit+
 
 ELITE Flap Wheel (available in wooden hubor spindle mount) or Portable File Belt - 60 grit+


Option 2: Larger area

Now you've leveled the weld and removed any heavy fabrication marks, bring these areas up to the base product finish by sanding the whole piece and get it ready for step 3.


 Deerfos SA331 Velcro Sanding Discs

Step 3. Finishing

Attach a Combination Flap Wheel (available in wooden hub or spindle mount)to your sander and set at a medium speed. Sand in the direction of the grain, making sure to maintain an even pressure.

If sanding on a corner, stainless tape can be applied to cover one side, while sanding the other, so that a sharp finish can be achieved on each side of the corner.

For best results:
  • Always sand in the direction of the grain.
  • Try to maintain an even pressure so that the finish is even..


 Combination Flap Wheel (available in wooden hub or spindle mount)
 

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