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i find by far the best way to mask is to use Copydex glue – rubber based glue, (neat or slightly diluted) with a masking fluid pen. you can get VERY fine lines that way. Alternatively, you can use any brush, but make sure you rub neat washing up liquid into it before you dip it into the Copydex, and wash it in soapy water immediately after use. no ruined brushes that way!

Have thought about trying it. Thanks.