Testor's Dullcote should be fine, its laquer based so its pretty much friendly with any surface. On color impregnated plastic, it does have the tendency to spot, so you probably need 3 very faint mist coats first before a final coat. This way you build a coat of fine particles before laying a final coat on(which should still be thin, but fully covering the model for an even finish). It will probably take just over 1 can to get a decent coat on it. Just make sure you wipe as much down as possible with rubbing alcohol to get as much oil off the tank(they are kinda covered with it) as possible. Any hobby store should have it on the standard Testors or the Testor's model master paint racks.

I may paint my bro's Bulldog for him(buy it for him, and then upgrade and paint it for him, cripes...)-and will probably use the USAF AS series olive drab Tamiya spray paints as its a little less green then the 'OD #2' TS series standard Tamiya spray...