How do I use masking tape so paint does not bleed?

Masking tape does not stop paint bleeding underneath — nothing does, because no tape seals perfectly against a textured wall. The trick is making the bleed invisible.

What you'll need

• Low-tack decorator's tape, and delicate-surface tape if needed
• A filling knife or an old credit card
• A damp cloth

Step by step

1. Clean and dry the surface first.Tape does not stick to dust, grease or a chalky surface, and a tape that lifts is a tape that leaks. Wipe and let it dry completely.
2. Choose the right tape.Ordinary beige masking tape is for general use and can pull paint off. Low-tack decorator's tape is for painted surfaces, and delicate-surface tape for fresh paint or wallpaper. They are not interchangeable.
3. Apply it in manageable lengths.Half a metre or so at a time, laid down rather than stretched along. Stretched tape pulls back as it relaxes and lifts at the edges.
4. Burnish the edge down hard.Run a filling knife or an old card firmly along the edge that will meet the paint. This is what closes the microscopic gaps, and it matters more than which tape you bought.
5. Seal the edge with the existing colour.The key step. Paint a thin coat of whatever colour is already there over the tape edge. Anything that creeps underneath is that same colour, so it does not show.
6. Let the sealing coat dry properly.Touch dry is not enough — give it the time on the tin. Painting the new colour onto a soft sealing coat lets both creep together.
7. Then paint the new colour.Two thin coats rather than one heavy one. A loaded brush pushes paint under the edge however well the tape is stuck down.
8. Brush away from the tape, not along it.Work from the tape outwards. Dragging a loaded brush along the edge forces paint under it.
9. Remove the tape while the paint is still slightly soft.Usually within an hour or so. Fully cured paint forms a film across the tape edge and tears when the tape comes off, taking part of your line with it.
10. Pull at a shallow angle, back on itself.Around 45 degrees or lower, slowly, away from the fresh paint. Pulling straight out lifts the edge; pulling fast tears it.
11. Score the edge if the paint has hardened.A sharp blade run lightly along the tape edge breaks the film before you pull. Only needed if you left it too long.
12. Never leave tape on for days.The adhesive cures onto the surface, particularly in sunlight, and then removes the paint underneath. Most decorator's tapes state a maximum time — respect it.
13. Consider cutting in instead.For straight wall-to-ceiling lines, a good angled brush and a steady hand is faster than taping and often neater. Tape earns its place on awkward junctions and hard edges.
14. Touch in any bleed with a fine brush.Even done well, a textured wall may show a fleck or two. A small artist's brush and the base colour fixes it in seconds.

Tips

• Seal the tape edge with the existing colour first. It is the whole technique and almost nobody does it.
• Burnish the edge with a filling knife. Pressure matters more than which tape you bought.
• Pull it off while the paint is still slightly soft, slowly, at a shallow angle.

Common mistakes

• Painting the new colour straight onto bare tape — No tape seals perfectly against a textured surface, so the new colour creeps underneath and leaves a ragged line. Sealing with the existing colour first makes any bleed invisible.
• Leaving the tape on until the paint is fully cured — The paint film bridges the tape edge and tears when pulled, chipping the line you were protecting. Remove it within the hour.

If it doesn't work

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