1. Surface Preparation of Sheets
Before Repair
By Dhanuka N Atapattu

2. Common types of sheet repair
• Adhesive bonded repair of metal structure
• Corrosion related repair of metal structure
• Composite panel and structure repair

3. Non – anodized Aluminum surface
preparation
• Grinding
– clean and degrease the surface.
– use commercial detergents, steam cleaners or
pressure washers
• Blasting
– Same as above
– Plus,
• Blister Repair
– Same as above
– Plus,

4. • Fast Drying Topcoat System
• Thoroughly clean and degrease the surface.
• Sand with 180 - 220 grit paper.
• Blow off the surface thoroughly with clean,
dry compressed air or vacuum
• Apply by air atomized spray 1 coat of Wash
Primer CF at 2 mils (50 microns) wet film
thickness

5. Anodized Aluminum surface
preparation
• Thoroughly clean and degrease the surface.
Use commercial detergents, steam cleaners,
or pressure washers.
• Anodized parts should be sanded with 80–120
grit paper
• Apply Wash Primer CF
• After sanding, the surface is now ready for
priming.

6. Aluminum Composite panel surface
preparation
• Cutting Aluminium Composite Panel
• Sanding Aluminium Composite Panel
• Priming Aluminium Composite Panel

7. Corroded Aluminum surface
preparation
• Tampico fiber brushes are preferred and are
adequate to remove most corrosion.
• Chemical conversion coating (Specification
MIL-C-81706) is a chemical surface treatment
used on aluminum alloys to inhibit corrosion
and to provide a proper surface for repair.
• When corrosion is found around a fixed
fastener head, the fastener must be removed
to ensure corrosion removal.

8. Special points to remember>>>
• If adhesive bonded sheets are removed, we
can use solvents to remove the gross
contamination effectively from an area.
• When damaged areas are cut away, the edges
of anodized sheets should be treated with
Alodine.