PREPARATION
Cleanliness is all-important! Try to make
sure no oil or CFCs are floating
about.
After preparation hose down garage floor
and it is advisable to keep the floor
damp during the painting of the body (to
keep dust down).
Preparation is all about patience.
Remove all trim, glass, etc or mask up
according to your skill!
Having a bare body shell to paint is
easier than masking everything &
risking edges
around the windscreen for example, but I
for one appreciate its a daunting
task
taking everything out!
STRESS CRACKS.
Two schools of thought here, I find both
work so its down to individual
skill with
gelcoat/filler.
Method 1, grind out cracks with an angle
grinder, or similar going all the way
back
to the matting, then rebuild with gel
& re-profile with 80 grit production
paper
(dry)
Method 2, score cracks into a
V (with a sharp screwdriver
for example) drill the
ends of each crack with a small drill
& fill with body filler, then
re-profile with 80
grit production paper (dry). This method
allows for easier repairs if you
dont feel
up to reshaping gel coat.
HOLES.
If you can get access behind the hole
then use matting, then fill from the
front
leaving the filler proud & re-shape
with 80 grit prod paper. Small holes
(such as
rivet holes) should be counter-sunk then
filled as above. Ariel holes for example
can be filled using ready mixed chopped
strand then finished with filler, but I
personally wouldnt use this method
for anything larger.
RUBBING DOWN
.
Decide how bad the paint is,
Is it original?
Has it been resprayed before?
If in any doubt take the paint back to
the gel, multiple coats and/or a mixture
of 2
pack & cellulose will not give you a
good base to work with.
If you are thinking about a respray in 2
pack and are spraying at home or near
other homes then DONT. 2 pack is
designed for industrial use, is not
healthy to
people with asthma, or washing lines with
a plastic coating on etc. (this comes
under the keep the wife/mother/girlfriend
happy heading)
You will also need special breathing
equipment and a compressor that is up to
the
job. 2 pack is also harder to rub down,
and it is difficult to rectify mistakes.
D.A Sander.
If you have a compressor big enough to
cope with a D.A. then use 180 grit for
the
rougher bits, finishing off with 320 or
400 grit. All swage lines and curves
should
be rubbed down by hand. If not then buy a
good rubbing block and start rubbing!
If you must use paint stripper, make sure
its OK for glass fibre. Make certain all
traces of stripper are removed. (Hint, I
never use chemicals on glass bodies)
ETCH PRIMER.
Not as necessary as people think, but use
it if you like, after any repairs are
finished. As usual follow the makers
guide.
SPRAY PUTTY.
The type I use is U-POL DEEP COAT. It is
great for covering repair areas or for
giving a bare shell a good coat to work
with.
If you have a repair finished off with
80-grade paper, 2 good coats of putty
will fill
it and after flatting will be ready for
base coats. (Follow the makers guide on
the
tin)
PRIMER
If you have decided to paint over the
original paint, rub it down then repair
as
required. Spot prime any repairs and rub
down with 320 wet/dry.
If you go for the bare shell option (I
would, but its easy for me to say that
having
all the gear!) I recommend 2 coats of
spray putty (just follow the makers guide
on
the tin) spotting any repairs first.
Dont worry about runs too much at
this stage.
Use the putty as a trial run for the
final coats.
PAINT SEQUENCE.
Start with the roof,
Spray a line down the centre of the roof,
then work back towards yourself to the
gutter. Move to the other side of the car
and do the same. Make sure the gun is
about 7-12 inches from the roof and as
square on to the panel as possible. You
are
aiming to put a good wet coat on the roof
with a 50% overlap at each pass.
From the roof move to the rear, coat the
hatch aperture from the top working
down, keeping the edges of the hatch and
rear-closing panel wet.
Once the rear is done move to the side
you started from and paint the rear wing
from the roof down, ending at the door B
post. Then do the same for the opposite
side.
If you have removed the doors, fill in
the door shuts and move to the front
scuttle/wiper panel, paint this, then
paint the bonnet recess.
Start from the engine bay and work back
to yourself across the wing top then
down the wing, keep a wet edge on the
front panel.
Do the same with the other wing then
finish the front panel. Paint the bonnet,
doors etc making sure they are well off
the floor. Repeat the process, starting
with
the roof.
Go and have a cup of tea, coffee, beer.
(This is not compulsory)
Leave the car overnight if possible to
dry out (or at least follow the guide
lines on
the tin for re-coating)
GUIDE COAT.
Any cellulose will do for this, but
preferably the same or lighter colour
than the
finished job. Mix guide coat to 70%
thinners & 30% gloss, and then spray
lightly
over the shell. You are aiming to mist
coat the car, not colour it fully.
RUBBING DOWN AGAIN!
Rub down the whole car with 320/400 wet
& dry using plenty of water and a
good
rubbing block. Do not use circular motion
(this always shows through the top coat,
thats why DAs are random
orbital) any imperfections will stand out
in the guide
coat. You can then spot fill as required
with spray putty and rub down with 400
W/D.
BASE COATS.
Mix the colour 50/50 with good quality
thinners. Spray pressure should be about
50 to 60 PSI. at the gun.
Before painting remove all the masking
paper and re mask.(this stops any loose
spray putty on the masking from falling
on to the fresh paint)
Clean the body with clean fresh water.
Blow off any excess water, paying
attention to gutters, door edges, intake
ducts
etc.
Use tack rags (sticky muslin cloth,
available from the paint supplier) and
lightly rub
over the prepared area.
Make sure you are wearing cotton overalls
or a throwaway paper suit, (nylon
attracts static therefore dust)
Using the same sequence as before, coat
the car with a good wet coat making sure
you overlap 50%. Put plenty of paint on
the edges of all the panels and swage
lines. Once you have been around the
whole car do it again starting from the
same
point. This should take about 2 to 3
litres of mixed paint.
You are aiming for a nice wet finish
without too many runs. If it looks like
the
Gobi desert, youre putting it on
too dry. This means you either have the
gun too
far away, are moving too quickly over the
panel or the air pressure is too high, or
all three!
If it looks like Niagara Falls then the
opposite applies. Dont worry about
runs at
this stage. If you have got them, then
leave the car overnight. Flat out the
runs with
600 paper & block
FINAL COAT PREPARATION.
Once you have rubbed out any runs, flat
the whole body with 600 paper and block.
You are aiming for a uniform flat finish.
Check the body for any faults and rectify
them now. (Spot prime, flat with 600,
spot with colour, flat with 600)
Wash the body with clean water, leather
off & blow down. Tack rag using light
strokes.
Mix the paint 60% thinners 40% paint.
Make sure you mix enough to coat the
whole body twice, (about 3 litres mixed).
Use the same sequence as before, putting
on two coats back to back. Aim for wet
finish.
METALLIC PAINT
A bit more involved than a straight
colour,
Use the same method as above only
increase the air pressure by 10psi.
Increase the overlap on each pass to 70%.
Paint the door inners, door rebates,
engine bay, bonnet underside,
Re-assemble the doors & bonnet.
Starting from the roof, work down the
sides of the rear wings.
Paint the front scuttle, bonnet, wing
tops,
Paint from the front of one side to the
back in fluid passes top to bottom.
Repeat for the opposite side, then fill
in the front and rear panels.
FINAL FINISH
If you are happy with the finish then
leave it for a few days and use T Cut.
If you want a better finish then flat
with 1200 paper (use a little hand soap
to
lubricate the paper). Wash the car then
use polishing compound (Farecla G7)
Then finish with T Cut. Do not use wax
polish for at least 2 weeks
You could end up with lots of little
white dots all over your nice shiny paint
job.
This is because the polymers in the wax
bite into the new (soft) paint and react
when wet. A lot of tedious polishing may
remove the spots, but will also remove
paint. YOU HAVE BEEN WARNED!
FINAL STATEMENT
As mentioned before, the methods
described above work for me.
Others may have different ways of doing
it; the world would be a boring place if
we were all the same. I hope this is not
too confusing to follow, I have tried to
write it from the laymans point of
view, however if there is anything you
are not
clear about, feel free to e-mail me
Home
|