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I've re-dyed quite a few of my 68' interior parts - both hard/soft plastic & metal. I use the Corvette America Interior Dye.
For the hard/soft parts make sure to clean all surfaces thoroughly with Dupont 2319S Plastic-Prep, blow dry with air, then spray using several light coats - letting each coat dry 1st. No need for primer.
For the metal parts I sandblasted 1st, then used carb choke cleaner, then blow dry with air, then apply a light coat of regular automotive primer (usually the dye will cover over the light gray primer better than the black - unless of course you're dyeing black!)
The dye matches the color of pre-dyed parts that you would purchase in the same color exactly so there is no need to worry about mixing/matching dyed/used parts with dyed/new parts.
As long as you clean-clean-clean, and be patient with many light coats, the finish will be excellent. Save yourself some $$ - as long as the part itself is in good shape re-dyeing yourself will be just as good as buying new parts (after all, the mfgs. dye the new parts in the same way!)
The dye available in spray cans works great. I used it to freshen a few interior panels and it matched fine. Just make sure to really clean well before spraying them.
I have every panel there is out of my '68 right now, and just cleaned/prepped/sprayed 80% of them 2 days ago (in the BASEMENT, because it was -3F outside in my unheated garage. My wife was NOT impressed!).
Anyway, it's no big deal pulling panels and trim (except the driver's side lower dash...lotsa wires to label, and that #$@**! steering column in the way!), just keep track of all your fasteners (sandwich sized ziplock bags and a permanent marker work for me).
Scorn...
Follow 68Mako's advice.
The only difference was I used a general auto primer, and I dyed my interior intact. I just spent the time a TAPED EVERYTHING.
p.s. Check out AutoZone or Prep Boys for the dye, they have it in stock - and it's only $4.99 a can, 1/3 rd the price of the Corvette Vendors.
The only difficult piece is the drivers side lower dash as mentioned above. I think it would be easier to pull everything else rather than spraying it in place. It will definitely result in a cleaner, better looking job. I have spot sprayed some pieces while they were "intact" on the car. Taping off the that drivers side lower dash and removing the other pieces for painting may be a good route for you.
Yes, I taped off everthing I couldn't remove easy.
I dyed the interior Black, along with the carpet - so overspray was of little concern.
I also used a 3" plastic putty knife made into a overspray catcher with a masking tape fan to create a much larger hand held catcher.
Picture a upsidedown triangle if you will.
I didn't find the lower driver dash any problems.
Within two months I won a "Best Interior" at a car show.
Guttrd my interior, put insulatio under the carpet, cleaned and PRIMED all parts -VERY important- slapped it back in, fixing the little things as I go. Looks great! I did , however, get the GM color dye mixed at the paint store :D Matches purfectly :yesnod: