Thanks for the great comments guys I really appreciate them 
thanks Patrick unfortunately that isn't available on the iPad 
cheers dave , I painted it in mid-stone then added burnt umber oil washes , then I gave it a dry brush of reddish brown acrylic , then a watered down pva coat and sprinkled rust weathering powder then another oil wash of burnt umber then a dry brush of mid stone in some areas then another coat of burnt umber oil wash then to finish off I sprayed it with thinned pva and got a big brush dipped it in the weathering powder making sure it was thicker in some places so it looks like it's crusted rust

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