Surface Finishing Services

For Metal and Plastic Parts

Surface finishing processes are used to improve the appearance, corrosion resistance, and adherence of a manufactured product. With methods including heat treatments, sanding and polishing, anodizing, painting, powder coating, laser etching, pad printing, electroplating(Zink, Nickel), and blasting, chromate we can make your products have the desired look and feel you want.

RpProto provides a wide range of surface finishing services to supplement our production services.  Contact our customer service team for a quick quote if you need a perfect finish for your prototypes or other market-ready products. Our skilled expert team handles the finishing process with the utmost care and efficiency.

Finishing Options
Sanding & polishing

Sanding & polishing

Very basic process to get smooth surface by removing cutting marks or printing marks. It is prepare your parts for later painting and plating. As well, it can be used to create the final surface finish. For a variety of metallic effects, we can provide brushed and satin surfaces, as well as optically clear polishes on transparent acrylics.

Anodized Prototypes
Anodized Parts


It uses electrochemical principles to generate a layer of Al2O3 (aluminum oxide) film on the surface of aluminum and aluminum alloys. This oxide film has special characteristics such as protection, decoration, insulation, and abrasion resistance.
It is typically used on machined aluminum parts to reduce corrosion and add an appealing metallic coloring. Anodizing is a scratch-resistant coating that is both a natural electrical insulator and one of the most durable finishes. 

On Materials: aluminum,      magnesium,    titanium.

  • Type I :             Basic type,  using chromic acid to produce a thin and ductile anodized layer on an aluminum part
  • Type II :           Utilizes sulfuric acid to produce a thicker anodized layer on a part, making it for a variety of visual effects
  • Type III:         Known as “hard anodizing”.  Also uses sulfuric acid, but produces a thicker anodized layer, is for surfaces that need to be extra hard
  • Chemical Film / Alodine:      Entails coating part with alodine to produce results that are comparable to anodization


Painting is a flexible ways to make your product a different surface appearance and textures.

Our master painters can supply millions of colors, for example :

          Matte,       Satin,       Flat,          Semi-gloss or High Gloss

We even create custom painted textures, such as :

          Spanght & Heavy,            Soft Touch ( Rubber spanke)

Soft Touching Rubber paint (Rubber touch, Swade touch), also known as leather paint, has a soft touch and a rubber-like texture that feels like skin. It is often used on mobile phone casings, game console handles, golf grips, sports equipment, electrical product casings, etc.

Plastic Painting
rubber painting
rubber painting 1-min
Laser Engraving

Pad Printing & Laser Etching

We have many methods to make markings of text, logos or symbols on your parts or prototypes.
We can provide:

Pad Printing

 Fast, reliable, consistent, colorful. used on most flat or curved surfaces

Silk screening

 For larger surfaces and when mixing multiple colors for even more complex graphics

Laser Etching or Engraving

 It is ideal for making the most precise and permanent marks on metal and and some plastics


It is a technology that uses electrolysis to attach a metal film to the surface of the metal to prevent corrosion, improve wear resistance, electrical conductivity, light reflectivity, and enhance aesthetics.

Electroplate a single metal or a combination of metals onto parts  to increas strength, lifespan, and conductivity of parts. 

Materials commonly used in electroplating include:

Zinc Plating

Nickel Plating

Copper Plating

Brass Plating

and more
Electroplating parts
plating parts
Brushing stainless steel


It is a surface process method that forms lines on the surface of the workpiece by grinding products to achieve a decorative effect. According to the different lines after drawing, it can be divided into: straight drawing, chaotic drawing, corrugation, and swirling. Used on metals where a series of tiny parallel lines are scratched onto the surface with a wire brush or polishing tool.

Sand Blasting

Sand Blast, Beads Blast

It is a process that uses compressed air as the power to form a high-speed jet beam to spray the spray material on the surface of the workpiece to be processed at a high speed, so that the appearance or shape of the outer surface of the workpiece surface is changed, and a certain degree of cleanliness and different roughness are obtained. Used to clean and deburr parts mechanically and chemically  in preparation for further surface treatments. Blasting also creates distinctive textures, such as frosting and pebbling.

powder coating

Powder Coating

The powder coating is sprayed on the surface of the workpiece with a powder spraying equipment (electrostatic spraying machine). Under the action of static electricity, the powder will be uniformly absorbed on the surface of the workpiece to form a powdery coating; the powdery coating is baked at a high temperature. It cures flat and becomes the final coating with different effects (different types of powder coating effects)

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