how to "smoke" clear plastic?

This isn't usually done with a paint, needless to say. I would try
using a dark blue or black model paint, thinned somewhat. You'll need
to experiment. Try some of the Testors acrylic model paint, with the
appropriate thinner.

Most craft stores have a selection of semi-transparent paints for
projects like faked stained glass. I'd try that first. Though they're
usually in colors, I'm sure they have a gray.


What remember!?! The whole three series is on DVD. Just in time for a
new generation.

-- Gordon

refer to the Tamiya PS range for painting clear Lexan RC car body shells,
especially PS-31 e.g.
http://www.acehobby.co.nz/ossb2/root/OSSBEC3/showitem.asp?PID )137

refer also to:
"Paints, Colour Charts, Mix Formulae & Strippers & How to spray F/Glass and
ABS plastics " on my web page or email direct for a copy of "Tinting Clear
Canopies "

Regards
Alan T.
Alan's Hobby  Model & RC Web Links
http://homepages.ihug.co.nz/~atong

Well, FYI, I've tried dying the plastic with Rit black die, and it
certainly tinted it, but not nearly as dark as I need.  This was after
what seems like extreme measures (left it in a hot dye bath for a couple
hours, and then turned the heat off and left it in there overnight).

I'm trying it again with triple the dye concentration (i.e., dumped in
two more packets of die), and had brought the water nearly to a boil
before putting the shell in, which I'm going to leave until at least
lunchtime.  I also added a bit of vinegar to the mix, since one poster I
found on the web claimed that this makes the dye work better.  So we'll
see, but after last night's experience, I'm not too optimistic.

Assuming this fails, the next step will be to try a translucent paint.  
Tamiya's PS-38 Translucent Blue might work, though I'd prefer black.  
One concern I have about this is the warning "Never use these paints on
plastic models" (they're made for polycarbonate).  I doubt my shell is
polycarbonate... will the paint just not bond well, or what?

Another possibility is this "Nite Shades" translucent black paint made
for automotive use: <http://www.amazon.com/dp/B0006HPLHO>

Any other suggestions?

Thanks,
- Joe

There are many types of plastic, some stain easily but others like PET will
resist all forms of dye. A matter of try and see.
The best paint to make windows appear black is the Tamiya Smoke PS-31. A
light application gives a tinted window effect but extra layers build up to
a black finish as used on the canopy of my large RC Bucker Jungman.

Regards
Alan T.
Alan's Hobby  Model & RC Web Links
http://homepages.ihug.co.nz/~atong

Aha.  Maybe this shell is PET -- it certainly is clear, tough, and
seemed to resist heat just fine, all characteristics of PET.  And yes,
it was very resistant to the dye too.


Thanks, that sounds good.  I'm still curious about the "Never use this
paint on plastic models" warning though -- will it just not stick, or
start a fire, or what?  I'm willing to try it and see what happens, as
long as it's not likely to be dangerous.

Best,
- Joe

remember to spray from the inside as its matt and very light coats as it
will run

The "plastic" they're probably talking about is styrene, which is
unlikelt to be what you're using. The warning is likely because the
paint has solvents that are unnice to styrene. The same solvents may
affect acrylic, so I'd test it first.

That said, I still think you'll do better with common, cheap transparent
and semi-transparent paints made for crafts. Don't you have a craft
store near by you can stroll through? Deco is a major brand.

Or, look in the Yellow Pages under plastics and find a local shop that
does the smoking for you. May be cheaper in the long run.

-- Gordon

Well, yeah, but it's not clear to me how I would use these.  Normally
you use these on a flat horizontal surface (or so I understand it).  
This is a curved surface, half a giant Easter egg.  If the paint is
thin, it's going to run right off and make a puddle in the middle.  If
it's thick enough to stick to the sides, it seems like I'd have brush
strokes galore.  (Maybe this is just a skill problem -- a more
experienced painter might know how to avoid that.)

Incidentally, I didn't find any Deco product that seemed appropriate,
but I did find one called Gallery Glass that I think is the same thing
as what you're suggesting:  <http://www.plaidonline.com/apGG.asp>

Maybe this Charcoal Black "Window Color(tm)" in particular:
<http://www.plaidonline.com/productDetail.asp?itemID 018>

As you can see in the sample to the left, it doesn't go on very evenly,
even in expert hands... but maybe I can live with that.  They do say it
can be applied vertically, which sounds promising.


Hmm, I looked for window tinters but those guys seem to work only with
glass; I don't know that their stuff would work with plastic.  A
plastics shop is a good idea.  Though I can hear the conversation
already: "Well, what kind of plastic is it?"  "...um... clear and hard?"  
:)

Thanks,
- Joe

A beginner's airbrush set is pretty cheap. That and acrylic paint
doesn't leave much brush strokes and applies evenly. As mentioned by
someone else here, if you paint on the *inside* you should have better
results. The best is to just do it.

Look under PLASTICS in the yellow pages for plastic fabricators,
plastics retailers, etc. Tinting/smoking plastic is a common thing for
most of them. They won't expect you to know what kind of plastic it is.
That's their job.

-- Gordon

Thanks, Alan, I'll try that.  Getting an even coat on a curved surface,
without making it too dark, may be a little challenging... but
fortunately, these plastic shells are cheap, so I can afford to ruin a
few if necessary.

Best,
- Joe

Paint will be difficult to apply in a uniform manner necessary to
produce a controlled level of light attenuation. Can you apply some
tinted film to the inside of the shell?

Contact an outfit that does auto window tinting to see what might be
available.



--
Paul Hovnanian     mailto:Paul@Hovnanian.com
------------------------------------------------------------------
If life was fair, Elvis would be alive and all the impersonators
would be dead. -- Johnny Carson

the Tamiya paint is easy to apply just apply in very light coats

I can't see how I could apply tinted film to a curved (ovoid) surface
without wrinkles galore.  However, I'm currently trying a spray-on
window tint from Testors:

  <http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=TESR2949>

I did about twenty coats last night, each very light because otherwise
this stuff tends to run.  It's not quite as dark as I want yet, but
other than that, it looks great.

Best,
- Joe