Aluminum Components - Painting Procedure
Group 99Paint Work
Bulletin Number
99 01 95 (4218)
Woodcliff Lake, NJ
June 1995
Product Engineering
SUBJECT:
Painting Procedure for Aluminum Components
MODELS:
E36/E38
Situation:
Due to the advantages in weight reduction, corrosion resistance, and recycle capability, aluminum body components are being used with increasing frequency. Considering this, it is essential to use the appropriate repair materials and procedures when repairing aluminum components.
Aluminum components can always be identified with a magnet.
Repair Procedure:
1. Cleaning and Sanding
Wash and clean the components to be repaired with Glasurit Silicone and Tar Remover # 541-5. Note: In VOC-restricted areas, always comply with local regulations. Restricted areas may require using Glasurit Prep Cleaner # 909 or # 905.
Sand damaged or oxidized areas with 80 to 120 grit sandpaper.
Important:
When sanding bare aluminum, always use new sandpaper. Sandpaper, sanding discs, body files, etc., which have already been used on a steel substrate, must not be used for aluminum repair. Small particles of steel may contaminate the aluminum surface causing a galvanic corrosive reaction which will subsequently lead to surface paintwork damage. This process also applies in reverse sequence.
2. Application of Body Filler
Apply Glasurit Double Plus Body Filler # 839-20 (mix with 2%-3% Glasurit Hardener Paste # 948-36) to affected area.
Important:
Sufficient adhesion of the filler material on aluminum components can only be achieved with Glasurit Double Plus Body Filler. Use of the wrong filler materials may result in loss of adhesion.
Body Filler Processing - See Chapter 8.1/1 in Original BMW Color System Painting Manual for processing procedures.
3. Priming
Primer materials must also be suitable for aluminum application. Apply Glasurit 2-K Primer Filler 285-16 (mixed with Hardener 929-28-2 and reduced).
Again, in VOC-restricted areas, regulations may require use of low VOC priming materials. Application of Glasurit Waterborne Primer # 76-86 will require a Pre-Coat # 76-22 over the bare aluminum substrate. Only materials suitable for aluminum components may be used in order to assure effective adhesion.
Primer Processing - See Chapter 8.2 in the Original BMW Color System Painting Manual for processing procedures.
4. Paint Top Coating
The refinishing procedure for top-coating is not different than that of the application procedures for refinishing steel components.
Observe the above-described procedures to assure effective adhesion to aluminum components.
Paint Processing - See Chapter 8.3 in Original BMW Color System Painting Manual.