A
A
I
I
R
R
P
P
L
L
A
A
N
N
E
E
T
T
E
E
C
C
H
H
N
N
I
I
C
C
A
A
L
L
D
D
E
E
S
S
C
C
R
R
I
I
P
P
T
T
I
I
O
O
N
N
,
,
O
O
P
P
E
E
R
R
A
A
T
T
I
I
N
N
G
G
,
,
M
M
A
A
I
I
N
N
T
T
E
E
N
N
A
A
N
N
C
C
E
E
A
A
N
N
D
D
R
R
E
E
P
P
A
A
I
I
R
R
M
M
A
A
N
N
U
U
A
A
L
L
5-11
Document No.:
EV97SLNOEN
Date of Issue:
02/2008
Revision:
-
5.6.2.2 Bonding rivet heads, big irregularities and material transitions
CAUTION
In case that airplane surface remains without top coat, carry out just rivet head bonding.
After perfect degreasing carry out bonding of rivet heads, big irregularities and transitions of
fibreglass parts with Al-sheet.
Epoxide and polyester bonding agents for car bodies are suitable; moreover for transitions
between two types of material with increased elasticity. Recommended bonding agents are shown
in the following tables.
Polyester bonding agents are applied with plastic spatula after being mixed with initiator. Grinding
with grinding paper with grain size of 240is made to smooth surface after drying .Remove dust
after grinding and clean with degreasing agent.
Epoxide bonding agent is applied from the special jet with static mixer by means of extruding
pistol. Excessive material is wiped off with spatula to final appearance before setting (slight recess
is not a defect) -
do not grind!
Recommended bonding agents
:
surface
manufacturer,
name
type
other components drying (grindable)
[min] / 20°C
Al-alloys
BASF
Glasurit 839-10
(base)
polyester
BASF
Glasurit 948-36
(initiator)
30
transitions
epoxide-
fibr Al-
alloys
BASF
Glasurit 839-45
(base)
polyester
BASF
Glasurit 948-36
(initiator)
150
Rivet heads
3M
DP-190
(base+
hardener)
epoxide
(elastic)
360
5.6.2.3 Application of primer (paint)
In order to reach a uniform resistance to corrosion and smooth surface, we recommend to carry
out application by means of spraying (air standard gun with the upper vessel, air HVLP gun, airless
electric gun). The adjusting of the used gun (given by manufacturer) differs according to the type -
air pressure, jet diameter. Primer should be applied in several sprayings (total thickness is not
reached at a blow) with defined maximum dwell and total drying time till further treatment or
handling.
Primer serves especially for anchoring (adhesion to the substrate) the top coats and can serve
also for eliminating irregularities of the surface (function of filler, for grinding).
For surfaces from Al-alloys we recommend to use the etch-primers for light metals based on alkyd
or materials based on epoxides or polyurethans (2-component paints); specific recommendations
according to the table on the next page.