How did you apply the masking? The directions say to spray it on. If so I need to pick up an airbrush possibly. I picked up 4 oz bottle at Hobbytown USA.
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Use a fine tip brush No.9:
17 Liner brush with inlaid, extra long needle-sharp tip
brush body made to hold large amounts of colour
selected Kolinsky red sable hair
short blue polished handles
packaged in a strong, transparent plastic tube
size No. 9