Technical data
13773-001
51-30
Page 2 30 Nov 2000
Note: It is unnecessary to use a straight primer when surfacer (high build primer) is being
used. Always apply the surfacer per manufacturer’s instructions. Usually surfacer will be
applied in three individual coats. It is preferable to use a finishing system (primer, sur-
facer, sealer, and paint) from one manufacturer for the entire refinishing procedure. If
body filler is applied prior to surfacer, allow filler to fully cure and then apply surfacer.
Surfacer should not exceed 4 mil. over large areas. No more than 5% of the total sur-
face area shall have surfacer thicker than 4 mil. On overlapping areas of repair, surfacer
thickness may be up to 8 mils. Surfacer thickness can be checked by multiplying the
average dried thickness (refer to manufacturer's information for average dried thick-
ness) by the number of coats applied.
(1) Application of Surfacer
(a) Acquire necessary tools, equipment, and supplies.
Note: When applying surfacer over a repair, inspect the repair to assure that it is
fully cured and has been properly contoured.
(b) Mask off all surfaces that do not require surfacer or where surfacer is not permitted.
CAUTION: Exercise caution when sanding composite surfaces to prevent sanding into
the laminate. Cover any system that may be contaminated by dust or where
surfacer may cause the system not to operate properly (for example, the
flight control system and the pitot/static system).
(c) Lightly sand the application area for surfacer with 120-grit sandpaper.
(d) Blow surface clean with compressed air.
(e) Solvent clean the application area with DX 330. (Refer to 20-30)
Description P/N or Spec. Supplier Purpose
Masking tape, 2-inch - Any Source Limit repair area
Sandpaper 120-grit to 400-
grit
Any Source Abrade bonding
surfaces
Compressed air (contami-
nate free)
- Any Source General repair
Surfacer/primer system
Base primer
Hardener
Reducer
Enhancer
K 36
K 201
DT
DX-84
PPG Industries, Inc. Aid paint adhesion
and to fill minor sur-
face imperfections
Cleaner DX 330 PPG Industries, Inc. Surface prepara-
tion
Cotton cloth (clean and lint
free)
- Any Source General cleaning