Surfacing or filling

Surfacing or filling

Repair operations on sheet metal (or plastic parts) usually require a surfacing and/or filling stage. It is very important to blend the product well, then apply a coating sufficient to cover the existing ondulations without exceeding the specified thickness.

Sanding

Dry sanding may be carried out by hand or using an electric or pneumatic sander fitted with the specified sandpaper.

Masking

The areas surrounding the parts to be repaired should be masked with sheets of paper fixed to the surface with adhesive tape.

The importance of this operation should not be underestimated and it should be carried out, like all the others, taking all the necessary precautions to avoid painting parts not involved in the operation. Masking should be applied:

• before coating with Primer;
• before undercoating;
• before coating with paint.

Coating with Primer

Primer is to be applied to bare metal surfaces, as protection against corrosion.

Sealing

Sealing must be carried out on sheet metals, to prevent the penetration of water or damp and is carried out with the use of different products.

Sealants are products that fill, insulate and protect and are to be used on sheet metal joints. Sealant should be applied with a brush or suitable spray gun.

Undercoating

Due to its thickness, the undercoating eliminates any imperfections of the layer beneath.

The undercoat must be prepared and applied following the instructions given in the corresponding painting cycle.

Sanding the undercoat

Sanding is necessary due to the thickness of the undercoat.

During this operation, to locate and remove any imperfections and waviness, it is advisable to spray a fine film of enamel (spy coat) on the surface concerned.

Preparation of paints

For the catalysis and dilution proportions for the preparation of painting products, closely adhere to the Manufacturer’s Instructions.