BRISTELL S-LSA, Руководство по техническому обслуживанию и инспекции

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15.CHAPTER
– AEROPLANE REPAIRS
Document: SLSA-MIP-5-4-0-US Date of Issue: 05/2016 Revision: -
15-15
15.6.2.3 Application of primer (paint)
In order to reach a uniform resistance to corrosion and smooth surface, we recommend 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 topcoats and can serve also for eliminating irregularities of the surface
(function of filer, for sanding). For surfaces from Al-alloys we recommend to use the etch-
primers for light metals based on alkyd or materials based on epoxy or polyurethane (2-
component paints); specific recommendations according to the Tab. 15-5.
Surface
Manufacturer,
name
Type
Further
components
Surface
mass
Recommended
thickness
Drying
(between
spraying / total)
18°C (65°F)
Al-alloys
BASF
Glasurit
801-1880
(base)
epoxy
BASF
Glasurit
965-35/2
(hardener)
Glasurit
965-50
(thinner)
8.49
[lb/in/sq ft]
1.6
[kg/mm/m
2
]
0.00098”
0.025mm
(at
0.00197” (
0.05
mm)
it can be also used
as filler)
15 min / 12
hours
epoxy
–
fiberglass
PC (Lexan),
PMMA
(Plexiglas)
Tab. 15-5
Recommended primers
15.6.2.4 Bonding
After total drying of basic coat we recommend to carry out total bonding of irregularities
including repairs of bonding. Recommended binders are shown in Tab. 15-4. After drying
perform sanding with emery paper with grain size of 240 until the surface is smooth. After
sanding clean dust and wipe off with grease remover and perform repairing paint coat by
primer (1/3 of coat thickness).
15.6.2.5 Application of top coat
In order to reach smooth surface we recommend again carry out the paint coat by spraying
(see 15.6.2.3).
Top coat serves especially for creating the coat resistant to weather and external effects for
aesthetic rendering of the unit. Considering the higher loading by external effects we
recommend to use top materials, exclusively two-component ones, on the acrylic-
polyurethane or polyurethane basis, always with guaranteed adhesiveness to the used base
coat (according to manufacturer). It is possible to use to advantage some of the coat system
for car repairing. In our recommendation (see Tab. 15-6) there are two types of colors: single
coat (color shade and protection in one) double coat (one-component color shade is formed
by the substrate and protection is ensured by two-component transparent top coat). By single
coat paint it is possible to reach the wide spectrum of colors, but it is difficult to do metallic
paint coats (we do not recommend them).