I'am afraid using SNJ spray metal

I've used the SNJ directly over the bare, but polished, plastic with no problems. It went on very smoothly, did not attack the plastic, and the polishing powder did a good job of adding extra shine to selected areas. I would like to figure out how to change the shade to allow different effects. On the stainless steel exhaust panel of the P-51D, I used a bit of Tamiya smoke to darken the aluminum.

Another thing I forgot to mention:

Find out what the SNJ website/email is and ask them for some guidance. I've had a few emails from them and they are very helpful with hints and tricks that can turn out a nice finish...

M/

I too have some SNJ sitting at my desk, but I've never used it!! I do know that one of the tricks to getting a really shiny surface is to use a black enamel paint as an under-coat before the SNJ. If you also have the polishing powder, you can work this into the surface after it's dried and it will really shine up the paint. You can also work the powder directly into the black enamel and it will shine up really well too. Sorry I can't describe the technique in more detail, but perhaps someone else has the secrets...

I've also use small amounts of the polishing powder to highlight various areas of my models. Almost like dry-brushing, you get a small amount on the brush and then drag it over the raised details. I find that the best time to do this is when the paint has just dried (ie.not wet anymore) , but not cured yet (the paint will still be 'soft'). Be careful with this powder though because it really floats around in the air and I'm not really sure you want to be breathing this stuff in. I use a respirator/filter mask.

Good luck!

M.