The following is a guide to help you paint your training remote that you have built from scratch, or from a kit. I hope you find it useful.  I am in the process of updating the information and photos, Besure to click on the links to see the new pics as they become available.
PAINTING THE TRAINING REMOTE
   The actual ball has faded over the years. In fact, its actually yellowed.   If you have pictures from STAR WARS exhibit in DC,  the colors may differ from what can be seen on screen or in earlier photos.   The ball is basically an off white with weathering.   You can paint your ball with any technique you wish to try.  Be creative!
    If you have a resin ball (there might still be a kit floating out there somewhere, but dont write me and ask I dont have any more)  be sure and wash the resin ball to get all the mold release off.    If you have scratchbuilt your remote, it probably looks like this.   If you glued your SCOTCH-LITE in your hatches, remember to stuff tissue paper into the hatches to protect the SCOTCH-LITE from paint.  I painted the ball with Model Master's flat white as a primer coat.  Letting the paint dry in between coats,  I used Gunze Sangyo's  H-316 ( Navy F-14, F-4) white as my base.   I like the way this paint airbrushes and this particular color is an off-white that worked for me.   I then dull coat the ball with two coats of Gunze Sangyo clear flat.
    Once dry,  I paint Polly S "red metal primer"  ( # 500006, any RED OXIDE also works ) in the recessed area around the truck rim hole.  There is also red between the two "canons".   I know it looks sloppy, but thats how the real one was painted also.
   On the top and bottom of the ball there are  Tank Treads.  The tank treads look rusted. I used  Windsor & Newton's Yellow Orchre to light wash the edge of the tread.  Wash the Yellow first, then go over again with a second wash using Windsor & Newton's Burnt Sienna to add the red color to the rust.  Use the pattern shown here.   Also refer to the photos of this area.
   Remember that post that is above the Panther gun port?  The top is painted silver, leave the sides alone.  The gun port is painted metallic black, or gun metal.  The three rectangles below the gun port are gray.   They look worn in my reference photos, but evenly painted in the film.  I used Polly-S Stone Gray (#501415).  I tried to match the worn look by using a wash letting the under color show though in spots.
   There are a series of rectangles that are along the "equator".  The exact color I am not as sure of as the other colors previously mentioned.   In the film they look light blue gray.  In the pictures I  have from the DC exhibit they look even lighter gray.   I can only suggest you use what strikes you as correct depending on the reference you are using.   I used Polly-S  light gray (#505061).  The color looks very even so I airbrushed it after masking the rectangles.  After I paint all the rectangles on the equator, I LIGHTLY airbrush the original off white color over them to subdue them a bit.
    The ball is now ready for the FINAL weathering.  I used Windsor & Newton's  Black giving my ball a nice black wash, dabbing it off with a rag here and there.   Letting the paint "sit" for different amounts of time before you dabble off gives  various intensities of stain.   The STAR WARS Universe has a dirty "used" look.   Weather until you think it looks right.  Don't forget the reference photos.
   Once you are done with your weathering spray another coat of dullcoat over the ball and let dry.  Now get your rims and add SCOTCHLITE to the center of them from behind. Glue into place very carefully as you do not want to get GLUE all over your red oxide paint.   I usually insert them and then drip HOT GLUE on them from the opposing open  rim hole on teh opposite sie of the sphere.    When the rims are done your remote is ready for display.  Fishing line can be inserted through the center tube and the remote can be hung from your ceiling or in a case  for a "realistic hovering look".   It can also be displayed in a case next to your favorite lightsaber!   Your version should look something like this.  Your JEDI TRAINING may now begin!!