Masking fluids such as those produced by popular paint manufacturers Humbrol, Winsor & Newton and Daler-Rowney for example have been around for a longtime and are basically liquid latex that dries in contact with air. Some dry to a transparent finish, while others, such as the Humbrol Maskol dry with a purple tint, which makes them easier to see when it is being used for masking clear glazing on aircraft canopies for example. For our use this is irrelevant other than the fact is does stand out in the photo a little better. Applying the masking fluid with the help of a piece of sponge or Scotch-Brite is a great way of creating controlled chipping effects on specific areas of a model and works very well when combined with hand painting tiny chips and scratches with a fine-tipped artist's paintbrush. To remove the masking fluid once the top layer of paint has dried is best done using a cotton bud that has been dipped in masking fluid and allowed to dry. It is then simply a case of rubbing the cotton bud over the paint's surface and it will quickly peal the off masking fluid to reveal a nice random chipping effect.
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