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MPU is an excellent preparation compound for brush and tank electroplating as it cleans, polishes and activates all in one stage. It quickly creates a water break free surface on a wide range of metals.


HS Code: 3824 99 70

Cleaning and activating the surface of an antique matchbox with MPU. Also comes in the MPU Fine and MPU Coarse versions. For instructions on use and guidance with making the best choice from our range of preparation products, please click HERE to see our Electroplating Manual.

Top tip! Try applying it with a damp sponge  – it won’t shred as tissue paper will.

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Features Used
One stage cleaning and activating product For cleaning and activating in one stage, can replace the ActiClean stage – saves time and money
Can be used during the plating process without having to re-electroclean and activate Clearing burns or other marks produced during plating – all you have to do is rinse and carry on plating


Surface preparation for electroplating - achieving a water break free surface

There are two main stages in preparing the surface of your work for electroplating;

1. The polishing stage
2. The cleaning and /or activation stage.

For the polishing stage you can choose either a) hand polishing or b) machine polishing.

For the cleaning stage there are a couple of routes you can go, depending on the condition and type of surface you're intending to plate. Whichever route you choose, you need to achieve a water break free surface at the end of the cleaning process as this is one of the best ways of ensuring an excellent plating result.

The following guidance is good for all three plating techniques - pen, brush and tank electroplating.

Many problems with electroplating occur because the surface wasn't prepared well enough. Once this stage is sorted, you'll get good electroplating results at the end!

Stage One - Hand and Machine Polishing

a) Hand Polishing

If you’re electroplating small, slightly scratched items, we recommend starting off with an abrasive polish, for example, Autosol. The traces of these types of abrasive polishes will need to be removed with solvent or if this isn’t available you can use our MetaPrep. The MetaPrep or solvent will then need to be removed with liquid detergent and then rinsed very thoroughly under running water. You can then move on to our MPU using tissue paper. For in-depth guidance on hand polishing, please click HERE for our ‘Polishing metal for electroplating’ page.

Stage One - Hand and Machine Polishing

b) Machine Polishing

This approach to polishing is only necessary if the item you’re electroplating is quite large and deeply scratched.

First, some safety advice;

•Wear a visor, gloves and tie loose hair back. Don’t wear loose fitting clothing or jewellery.

•Bring the work up to the mop, using only the bottom section.

You may have to work through two or three stages of polishing, changing mops and corresponding polishing bars. The table below gives guidance on which polishing bar to choose. To see examples of the various mops and polishing bars, refer to the in-depth section on polishing further on in this manual. Once the item is polished, go onto the cleaning/degreasing stage.

Surface of work Type of polishing bar Type of mop
For very deep scratches Grey bar Sisal
For medium scratches Green bar Stitched
For the final polishing Blue bar Loose leaf

Stage Two - Cleaning/Activating

Cleaning means removing all dirt and oil. Activating means removing the oxide layer that builds on metal, particularly with stainless steel, nickel and nickel containing alloys such as nickel silver. You may have to have a separate cleaning and activating stage, if your work is made of stainless steel, nickel or nickel containing alloys.

Here are the steps you need to go through for this stage of the surface preparation process;

If you have machine polished or hand polished with Autosol, clean the traces of polishing compound off with a solvent or MetaPrep and then remove all traces of solvent or MetaPrep with liquid detergent. Rinse off all traces of detergent thoroughly under running water so that no suds remain.

Then if your work is small to medium sized and has a fairly smooth surface and isn’t made of stainless steel, nickel or nickel containing alloys, finish the cleaning/activating stage with MPU. This cleans away all remaining traces of oil and activates the surface at the same time.

However, if your work is made of stainless steel, nickel or nickel containing alloys, is very large or has a very uneven surface, use our ActiClean to clean and activate in one. Use a Carbon Electrode (preferably) or a Platinum Electrode.

A Water break free surface

The ultimate aim of polishing and cleaning/activating is to make a water break free surface, as illustrated in the picture to the right.

On the top half of the copper sheet, the surface isn’t completely clean and so the water is gathering up into droplets and staying on the surface of the metal.

However, on the bottom half of the copper sheet the water has completely drained off the surface as it is completely clean and doesn’t provide anything for the water to cling to or gather around. This is a water break free surface and is ideal for effective electroplating. This should happen after you’ve completed stage 1 and 2 above.


General guide;

Certain small items, for example Swabs, Nibs and Plating Pens can be sent by normal post within the UK

  • The courier option for UK deliveries is FedEx
  • Free UK mainland delivery available on orders over £200
  • International orders usually 3-5 working days.

For all price quotations for deliveries, please add your items to our shopping cart. You will be able to see the shipping costs by clicking on the ‘Calculate shipping’ button in the cart and before checking out.

Please click on the link below to download the SDS for this product: