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1. Paint the entire part with silver enamel except the area that is supposed to resemble glass.
2. After step 1 dries......I use either the interior color or the exterior base color of the vehicle to over coat the parts that I just painted silver . Be sure to leave a few "nicks and scratches" on the periscope by leaving a small amount of silver showing here and there.
3. After step 2 dries.......apply a little thinned down Tamiya Clear Green acrylic paint to the areas that are glass. Once dry, this color really looks like armored glass.
I hope this helps........Let me know if you have any questions or need pictures
..........Otto

thank you, that's a great tip !

Good tip, just some nitpicky questions........ Why do you paint with silver first? Could you also drybrush with silver afterwards?
Also, the part you brush the clear green on isn't clear to begin with, right?

I have another good tip involving Tamiya clear green. If you have one of those Tamiya clear bottles and want to make it look like wine, paint it first with clear red. When that's dry, put the clear green on, just like a real bottle of red wine, and it looks like one too. Then you just paint on whatever colour you want for the foil on top and put the label on.

Nic

Great tip! I will be using this one. Thanks!