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if you use gundam marker, just run the marker through on the panel line, if you use tamiya panel line accent colour, just touch point along panel line and it will naturally disperse the paint along the groove.
after dry, rub away the excess paint on the panel with tamiya enamel thinner and cotton swab
Thnkzz fir yur help.
for example
Suprrbb
There is some new technic , I’ll see if I can’t find it
Thnkzz