Sandblasting metal before painting is an extremely efficient way to remove built-up layers of dirt and damaged paint, producing a clean and undamaged substrate on which to apply new paint. Although some materials, such as aluminum, can be painted without other preparation due to their inherent corrosion resistance, steel must be carefully primed with zinc coating prior to painting, particularly if doing vehicle bodywork.
Wet a rag with wax and grease remover, then thoroughly wipe the part that has been sandblasted first with the wet rag an then with another dry rag. This will remove any residue of grease or dust produced by the sandblasting process, leaving the metal in its natural state. Be cautious to avoid touching the metal with your hands as the oils on your fingers can damage paint.
Dust the metal with a light coat of self-etching primer, ensuring that not too much is used. The primer should appear as little more than a tint of the metal, rather than an all-over primer. Allow the primer to dry according to its packaging instructions.
Next, spray the item with epoxy primer providing at least three light coats. Be careful not to put too much epoxy primer as that will result in runs or sags in the part, requiring sanding. Applying several light coats prevents the need for sanding. Allow the epoxy primer to dry according to the package directions before applying paint to the sandblasted part.
Sandblasting can give old metal objects a much brighter future. Regardless of the metal and paint, rust or dirt that has been on it, our low pressure cleaning systems can restore your property to its former glory. Gero Sandblasting metal restoration services are available on all metals including steel fabrications, cast iron fireplaces, railings, gates, water wheels, vehicles of every description and metal stairways.