TM-1-1500-344-23-2
AIRCRAFT VOLUME II
TECHNICAL MANUAL; CLEANING AND CORROSION CONTROL
APRIL 2009
TM-1-1500-344-23-2 - Page 133 of 240
7-17
NAVAIR 01-1A-509-2
TM 1-1500-344-23-2
15 April 2009
7-7.2. PRIMING. All surfaces to be sealed, with the
exception of internal fuel tank surfaces, shall be primed
with MIL-PRF-23377 or MIL-PRF-85582 in accordance
with Appendix A (Navy) or TM 55-1500-345-23 (Army),
and allowed to dry one to two hours at ambient
temperatures before sealing.
CAUTION
After surface treatment and primer application,
do not contaminate areas to be sealed with
hands or tools.
7-7.3. MASKING. To prevent sealant from contacting
adjacent areas during application and smoothing out
operations, the surrounding area not being sealed can
be masked off with AMS-T-21595 Type I masking tape
(Figure 7-10). In cases where the tape is likely to remain
in place for more than two days on items exposed to
direct sunlight and where tape residue on the surface
cannot be tolerated, use AMS-T-22085 Type II
preservation and sealing tape. An example where
masking tape may be useful is during fillet sealing of
exterior surface lap and butt seams.
NOTE
Always pour solvent onto a new cloth to avoid
contaminating the solvent supply. Clean one
small area at a time. Reclaimed solvents or
soiled cleaning cloths shall not be used.
7-7.4. ADHESION PROMOTER. If adhesion promoter
is required, the surfaces shall be cleaned with a solvent
(AMS 3166, A-A-59281 Type I or II, or equivalent)
immediately before applying adhesion promoter.
Contaminants such as dirt, grease, and/or lubricants
must be removed to insure good adhesion. Apply a very
thin coat of the adhesion promoter to the solvent cleaned
surface with a clean cloth (AMS 3819), wipe off any
excess with a clean cloth, and allow the surface to dry
for 30 minutes to one hour. If surface becomes
contaminated or sealing is not accomplished within an
hour after application and drying of adhesion promoter,
repeat cleaning procedure and reapply adhesion
promoter.
WARNING
Sealants, with the exception of ePTFE sealing
tapes, are toxic; therefore, rubber or
polyethylene gloves and goggles shall be worn
when using these materials. Wash hands
thoroughly with soap and water before eating or
smoking.
7-7.5. BRUSH, SPATULA, OR SEALANT GUN
APPLICATION. Prior to masking and sealing, prepare
surface in accordance with paragraphs 7-7.1 and 7-7.2
CAUTION
After surface treatment and primer application,
do not contaminate areas to be sealed with
hands or tools.
a. To prevent sealant from contacting adjacent areas
during application and smoothout, outline the areas
being sealed with masking tape (AMS-T-21595 Type I)
so that each tape strip is
1
⁄
8
to
1
⁄
4
inch from the edge of the
seams (see Figure 7-10).
b. If required, apply adhesion promoter in accordance
with paragraph 7-7.4.
c. Apply sealant between tape strips.
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