White Washi Tape from Nichiban. White Washi Tape #251 is ideal for masking watercolor and oil painting. It is also very popular for model building.
It's designed to hold firm and peel off without damaging delicate surfaces, like watercolor paper. Paint doesn't seep under the edge, so you get a razor-sharp line when the tape is removed. It's also very flat and thin, so you won't see pooling at the edge when painting over Nichiban tape.
Nichiban #251 Artist Tape - Standard - 18 mm (0.7)
Nichiban Masking Tape - John Neal Books
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Nichiban Tape Mish Esthetics
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3 pack 1/4 .25 inch x 60yd (6mm x 55m) Thin STIKK White Painters Mask – STIKK Tape
Tape Used For Painting Discounted Shoponline
Nichiban #251 Artist Tape – St. Louis Art Supply
Office Tape for Sale
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Nichiban Masking Tape - This artist-quality masking tape is renowned for being extremely thin but leaving an incredibly clean edge.
Nichiban #210 Masking Tape
Office Tape for Sale
Tape Used For Painting Discounted Shoponline
Nichiban tape is ideal for light packaging and temporary adhesion. Available in 3 widths: 9mm (3/8), 12mm (1/2), or 24mm (1) x 18 meters (59ft)
Nichiban White Masking Tape, Various Widths