I have continue the painting with a little leaching. I have done the dark washes on the tank. I used artist oil paint in VanDyck brown colour, that had been thined highly with MIG thinner ( P239). After 5-7 minutes expectation I have washed down the sloshed surfaces with MIG thinner. I left the surfaces here and there more darkly ( in corners, cracks, weld lines ) or more brightly ( armour-plate's area ).