with an airbrush that they still need to be glued and that the glue needs the plastic on both parts of the model to bond together properly. If  not the glue eats away at the paint trying to adhere to the plastic and can cause an awful look to the model. Trust me!!. This model was the first that I learned to use an Airbrush and allot of mistakes where made, so you reading this can avoid the same things I did not. :-).
  The over all base colour used was No.127.  I found a 2 coat application was best for now because later on the base colour would be used again to "Tone Down" or "Blend"

  Using a Index card or a piece of Frisket film, holding against the hull in line with the Defensive grid. Lightly mist  using colour No. 140 at the edge of the masking medium. Pull the Index card or what ever masking medium you are using away and move on to the next grid line.
  TIP! Work from the back to the front of the model when weathering, so the Index card will not touch any wet parts.

  When you find that there are no grid lines to work with, hold the masking against the hull at a right angle to the overall shape of the part the weathering is being applied. When all the parts have been completed allow to dry thoroughly. To "Blend" in  or "Tone Down" the weathering effect using the base colour again No. 127 Lightly apply a 'mist' coat over all parts of the model. Please remember to mask off any areas of the model, clear parts etc. that might be effected before starting this procedure.