Looking for Panel lining advice.

JLKahn

but the turpentine I thinned the oils at through the clear gloss on my test piece like acid.

Wass this a "natural" turpentine? If so, avoid it like the plague. Use an oil-based turpentine substitute like Turpenoid (blue can).

Keep in mind that though odorless, there are still vapors, so make sure you have plenty of ventilation and/or use a respirator. Just because you can't smell it, it doesn't mean that it's not there.

I mix up pastels with water and a drop or two of dish soap for a pin wash and it cleans up with water.

Some folks use a very sharp pencil. That avoids worries about applying solvents. Personally I use lacquer clearcoats and that works fine for anything less hot than lacquer.

Hi;

    The few times I've done it( On 1/32 scale and 1/24 scale aircraft) I have used a wash of alcohol and Pastels. This has worked and when good and dry I mist coat it till I know everything is good to go.