How to polish metals and plastics using Dialux polishing compounds

When polishing metals, traditionally jewellers would have used Tripoli, a rouge for polishing precious metals. Now, companies like Dialux offer a whole range of different products for different metals and different finishes.

Dialux polishing compounds are made in Germany. They are a premium polishing compound and a firm favourite for all those looking for a superior finish to their work. They are very popular with jewellers and watch makers the world over.

They come in small bars consisting of a compound which is uniformly blended with abrasive grit. Rather like sandpaper, by varying the size of the particles and the material, you can create different levels of abrasiveness and therefore, different finishes on different materials.

The below Dialux Polishing Chart shows the different polishes, and tells you what material it's suitable for, and the level of finish you will get.

It's important to say that the chart gives a guideline only. Do experiment and see what works for you.   For example, you may have a piece of nine-karat gold that's been hammered or put through a rolling mill, and it may be quite hard. In this case you might want to use a harsher compound. Or you may have a thin 22-karat gold ring, that is very soft. In this instance you may wish to use a more gentle polish.

How to Use Polishing Compounds

Start with an even sanded surface. I like to sand down using a Horotec Buff Stick, ensuring you have removed any dents, tool marks, or deep scratches.  Next apply a small amount of your chosen Dialux compound to a felt bob, cotton buff, calico wheel, belt or wheel.

Pre-polishers

Pre-polishers are the most abrasive and will remove small scratches left over from your buff stick.


The Yellow Dialux (DLUXY) is a pre-polish for softer metals such as Bronze, tin and copper and also for use on plastics.  Use this prior to final polishing with Blue Dialux (DLUXB).  The yellow also works well with silver and gold.

The Grey Dialux (DLUXG) bar is quite aggressive and I like that in a pre-polish. It’s great for removing scratches particularly platinum and stainless steel. Follow this up with Green Dialux (DLUXV)

Orange Dialux or Vornex (DLUXO) is designed for use on steel and stainless steel as a pre-polisher.  

  • Go slow. As a pre-polish is more abrasive than the other bars in the Dialux range, keep the speed slow to reduce friction heat
  • Once you've removed all your sanding marks, clean your piece of work.
  • It's important that you remove all traces of previous polish. 
  • Keep all your mops separate, don't allow any cross-contamination, especially on your final finishing mops, or you won't get the desired effect.

Polish

After your pre-polish, use a polish to achieve a shine. 

Within the Dialux range you have a few choices depending on your material.

The White Dialux (DLUXW) are great for silver and gold. Also for final polishing on plastics. Blue Dialux (DLUXB) is also great for silver and gold.

Use this with a soft mop like a soft, loose, cotton buff,  or if using a Dremel, you might want to use a little calico wheel

If you finish off with a soft cotton mop or buff, you may find with silver and gold that the white is sufficient on its own.

Grey Dialux (DLUXG) is designed for polishing stainelss steel. It's useful to have this in your workshop, and even if you don't specifically work with steel, it's great for polishing tools such as bench blocks, punches, and hammer faces.  Use with a felt wheel or bob

Final Polish: Mirror Finish

So now you've pre-polished and polished, and this may be sufficient, but when working with silver and gold jewelry, you really want that extra sparkle.

Black Dialux (DLUXN) is widely used by silversmiths and will give a great result on silver. Use it with a very soft cotton buff. 

Red Dialux (DLUXR) is similar to traditional rouge and is therefore another ideal alternative for silver and gold. Again, using a soft mop

Blue Dialux (DLUXB) is a more general finished polish and therefore ideal for non-precious metals such as copper, tin and brass for instance. Use this after pre-polishing with Yellow Dialux (DLUXY)

Green Dialux (DLUXV) is a final polish designed for hard metals such as steel and platinum. Use after pre-polishing with Grey Dialux (DLUXG).

White Dialux (DLUXW) is a general final polish for most metals and plastics

If you prepare your pieces well, then you should only need two or three polishes to get a great finish.

Click Here to Buy Your Dialux Polishing Compounds

Dave Wilson of Celtic Dreams had this to say about them:

“Personally, for gold I use yellow, white, and red. For silver, I again use yellow or sometimes the grey if I want something tougher, and then the white and black. I like the size of these little bars. I think they're small enough for use for the pendant drill, but still big enough for use on the bench polisher too. They're not too greasy, so they're very easy to clean up in between stages with warm, soapy water. I think they're great value, and from what I can see, they offer good, consistent, streak-free finish. So personally, I highly recommend them, the Dialux range of solid polishing compounds”