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Spray paint general knowledge
and common problems settlement
Spray paint compose
and classification
◎Spray paint
normally composed of aerosol can, valve and actuator, content(paint) and
properllant, and also glass ball for paint mixing purpose
◎Spray paint
classification
Spray paint has no
strict classification standard, the common classification method is
according to people’s usage habit. The common prevailing classification
method is Botny’s method, which devides spray paint into three groups:
Spray paint for car, spray paint for motorcycle and decoration spray
paint. Then it can also be divided into nitro spray paint, alkyd spray
paint, heat-plastic acrylic spray paint and etc. according to the
vehicle resin.
Botny spray
paint comprises of four kinds:
1. B-04-9 heat-plastic acrylic
resin spray paint
2. B9332 nitroacrylic
resin spray paint
3. W61 silicone resin
high-heat durable spray paint
4. Other special spray paint
Heat-plastic acrylic
resin spray paint dries quickly and easy to use. The solid percentage
and spreading rate all surpass nitro-magnetic spray paint, however it
has poor gasoline-resistant ability. It is not suitable for spray
painting to contact gasoline or other organic solvent such car and
motorcycle; mainly used to indoor and outdoor decoration, surface
decoration of mechanic equipment and plastic.
Botny spray paint features:
Using domestic
high-quality raw material and together with imported key raw materials
with fine technics, advanced technology, superior material, with strict
technics control and quality assurance(Botny passed ISO9001
international quality assurance certification), Botny has distinctive
advantage in product quality comparing with similar competitor in China.
The mainly features will be the following:
1.Superior
weather-resistant ability;
2.Excellent
light-preserving, color-preserving features;
3.Strong
Chemistry-resistance and water-proof ability
4.Good
adhesive ability using together with proper prime
5.Good
feature of flattening and good spreading ability.
6.Good
polishing ability
7.Wide
range of use, good matching ability, can be used together with various
prime on various substrates.
Disadvantages of
other brand spray paint
1．Bad
feature of flatting, easy to have disaffection surface.
2．Poor
spreading rate.
3．Solvent
not easy to release, hard to dry to solid.
4．Poor
paint spreading and moisture feature, easy to have different colors.
Spray paint settlements for common problems:
Common problems which happened
during spraying
Block in the valve
Reasons:
1. Didn’t shake evenly before
use, which cause the paint solid in the bottom block the actuator; 2.
Shake too hard to break the glass ball to block the actuator; 3. Didn’t
upside down to clean the actuator and the paint dries to block the
actuator; 4. Upside down or side down during storage which cause the
paint deposit block the valve.
Precaution methods:
1.Shake
evenly before use; 2. Master right shaking method and avoid shake too
strong; 3. Upside down can for 3 seconds to clean the remaining paint on
actuator to ensure normal use next time if can’t use up all the paint.
4. Be sure not upside down or side down during storage.
Correction methods:
1.
Shake evenly and upside down can for 3 seconds and spray out the blocked
actuator
2. Change actuator.
Can’t spray all
out(spray pressure down)
reason：
1.Inverse
spraying during spraying; 2. Incline more than 45°during spraying; 3.
Storage time too long and exceed the shelf life. 4. The curving
direction of inducing tube of the actuator is on the contrary of
actuator whole.
Precausion methods:
1. Master right spray
technology and avoid upside spray; 2. Avoid incline can more the 45°; 3.
Avoid use invalid spray paint; 4. When remaining paint is around 20%,
and feel the thickness is not enough(spray out mostly properllant), turn
the actuator 180° and use again.
Correction Methods:
1. When find spraying
pressure decrease, please try to use up the can at one time; 2. When
spraying pressure is not enough an also the temperature is low, please
warm the can with 50℃ water and then use.
spray paint low
viscosity(solvent too thin, poor covering ability)
Reasons:
1. Didn’t shake evenly
before use; 2. Can incline angle too large when spraying which makes the
spraying with too much gas and dilutes the paint; 3. Weather too
freezing with low temperature; 4. Lack of heating system with poor
ventilation; 4. Spray too thick for the first time(Bright color)
Precaution methods:
1. Master right
spraying technic, avoid upside down spray and inclined spray; 2. Avoid
using in overcast and rainy, humid, freezing weather.
Correction
Methods:
Use under room
temperature, or put the sprayed object into 50℃-60℃ warming equipment.
Disadvantage and
prevention of humid paint film after spraying
Orange peel
Reasons:
1. Spray distance too
far away or too near; 2. Uneven frosted paint solvent; 3. Spray too
thick or thin for the first time.
Precaution methods:
1. Master right
spraying technics; 2. Shake sufficiently and make paint even or warm
properly; 3. Pressing with forefinger with even strength and ensure the
spraying rate steady and even.
Correction Methods:
Low-grade orange peel:
Use sand paper above P1500 and wax to polish after paint dry to solid,
severe orange peel: Use sand paper above P800 after paint dry to solid
and respray.
Flow hanging, dripping
flow, droop flow, flow drop)
Reasons:
1. Distance between
actuator and object to near; 2. Actuator moving speed too low; 3.
Poor-ventilated environment when spraying; 4. Dry time not enough during
different layers. 5. Surface not clean enough.
Precaution
Methods:
Keep proper spraying
distance(15-25cm); 2. Keep normal actuator moving speed(30-60cm/s); 3.
Keep well-ventilated environment; 4.Set drying time(3-10min) for
different layer according to temperature; 5. Ensure clean surface before
spraying.
Correction methods:
1. Slight flow
hang: Use sand paper above P1500 and wax to polish when paint dry to
solid(16h in room temperature); 2. Severe flow hang: Use sand paper
above P800 to polish after fully dry and respray.
White frost
Reasons:
1. Humid spraying
temperature; 2 Well-ventilated freezing spraying area.
Precaution methods:
1. Avoid spraying in
humid, rainy, high temperature or too humid weather.
Correction methods:
1. Spray quickly Botny
Retarder on the white area; 2. Use infrared light to roast quickly(lower
than 60 ℃); 3. Use wax polish and clean after paint dry to solid; 4. Use
sand paper to polish for severe white frost and respray.
Bubble, granule
Reasons:
1. Paint solvent not
properly mixed; 2. Finger spraying pressure uneven and spraying not
smoothly to cause residual paint; 3. Spray too thick; 4. Spraying
surface is polluted.
Precaution methods:
1. Shake plentifully
to mixing evenly the paint solvent; 2. Even speed spray; 3. Clean
totally the surface to spray.
Correction methods:
1. Slight bubble: Use
clean cotton cloth to wipe after dry and continue to spray; 2. Severe
bubble and granule: Use sand paper above P800 to polish after dry to
solid and respray.
Biting
prime
Reasons:
1. Prime
and surface paint not match, surface paint solvent dissolves the prime
paint; 2. Spray surface paint before prime paint dry; 3. Spray surface
paint too thick for the first time.
1. Avoid
spraying directly to oil-based single-ingredient paint film. 2. Spray
brown paint between unmatched prime and surface paint; 3. Spray thinly
several times and keep plenty dry time when spraying.
Correction
methods: Shovel the biting prime part when paint dry to hard, then add
putty, dry to flatten and spray middle layer before surface paint.
Crinkle
Reasons:
1. Spray
too thick; 2. Poor self-dry condition such as low temperature,
high-humidity temperature or over-ventilated. 3. Polluted air or
poor-ventilated environment.
1. Avoid
spraying too thick; 2. Guarantee the fresh air and normal temperature
and humidity in spraying temperature.
Correction
methods:
Slight
crinkle: polish after dry to solid and respray; Severe crinkle: shovel
crinkle(or use Botny De-paint to remove), the fill in putty, spray prime
and respray surface.
Reasons:
1. Unclean
surface 2. Polluted environment such as too much dir on ground and in
the air; 3. Other polluted source like operator’s body, or dirt on
covering newspaper.
Precaution
methods:
1. Clean
totally the surface; 2. Ensure clean environment and air; 3. Remove all
possible polluting source; 4. Block surface which will produce dirt.
Correction
methods:
1. Slight
dirt or granule: use sand paper above P1200 and wax to polish; 2. Severe
dirt of granule: Polish flatten and respray.
Dry
spray(thick granule)
Reasons:
1.
Distance between actuator and surface too far away; 2. Move too fast
when spray.
Precaution
methods:
1. Master
good spraying technics; 2. Ensure well-ventilated spraying environment.
Correction
methods:
1. Slight
dry spray: Use sand paper above P1200 to polish with water and after
paint dries; 2. Severe dry spray: Use sand paper above P800 to polish
and flatten and respray.
Disadvantages and preventive action of dry paint film after spraying:
Crackle
Reasons:
1. Prime
and surface paint not match, flexibility and rigidity grade too large;
2. Spray surface paint before prime paint dry; 3. Spray surface paint
too thick; 4. Old prime aging, pulverization and crackle.
Precaution
methods:
1. Ensure
prime and surface paint can be matched, add middle paint if necessary;
2. Master proper spraying technics; 3. Clean the aged prime and respray
surface paint.
Correction
methods:
Shovel to
naked metal or remove the paint and respray.
Peeling
Reasons:
1. There
is grease, watermark, or dirt on the base material; 2. Base metal
surface too velvet or without polishing; 3. Old prime aging,
pulverization and crackle.
Precaution
methods:
1. Clean
thoroughly the surface; 2. Use sand paper to polish metal surface; 3.
Removed aged paint and respray the surface paint.
Correction
Methods:
Shovel the
peeling parts and loose parts and respray.
Rust
Reasons:
1. Base
rust not removed completely; 2. Bug on the surface(such as pinhole and
bubble, etc) 3. Surface is polluted by such as fingerprint and water
mark; 4. Didn’t spray anti-rust layer or layer too thin which makes the
water and air to corrupt the base materials.
Precaution
methods:
1. Ensure
base material complete clean; 2. Ensure surface paint free from any
damage; 3. Spray prime before surface spraying if necessary.
Correction
methods:
Use Botny
De-rust to remove rusted old layer or shovel to naked metal and respray.
Pulverization:
Reasons:
1.
Spreading film long time exposure to strong sunlight 2. High contents of
industry power, water and baleful gas(such as CO2, SO2).
Precaution
methods:
1. Avoid
spreading film long time exposure to sunlight; 2. Keep spreading film
tidy.
Correction
Methods:
Use Botny
De-rust to removed pulverized old paint layer or shovel to naked metal
and respray. |
