How to Get Clean Paint Lines with Painter's Tape
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The tape is not what stops the bleed
Most people stick the tape down, paint up to it, peel it off and then find a wobbly furred line underneath where the paint has crept along the edge, and the natural conclusion is that the tape was no good. Usually the tape was fine and the edge was never sealed, because paint only needs a few microns of gap to wick along under an edge, and a strip of tape laid on a wall has a few microns of gap all the way down it.
So everything below is about sealing that edge rather than about the tape itself.
Get the surface right first
Tape will not stick to dust, and it will not stick to anything greasy or damp either, so wipe the surface down with sugar soap and let it dry properly before you start. On a skirting board or an architrave that has not been cleaned in years, this one step makes more difference than the brand of tape does.
If the surface is chalky, which old enamel trim often is, give it a light sand first, because tape sticking to a loose layer of chalk is the same as tape not sticking at all.
Lay it down and press it properly
Run the tape in lengths you can control rather than trying to do a whole wall in one go, and overlap each new length slightly onto the last so there is no gap at the joins. Then go back along the whole run and press the painting edge down hard with a putty knife, a plastic scraper or the edge of an old credit card. A thumbnail does not do it, and that is where most of the failures come from.
Lock the edge with the colour that is already there
This is the step that turns a decent line into a sharp one. Before you put the new colour on, brush a very thin coat of the existing wall colour along the taped edge, so if anything bleeds it bleeds the same colour as the wall and nobody ever sees it. That thin coat also dries into the gap and seals it, which is what stops the new colour getting under at all.
Let it dry before you start on the new colour.
Do not overload the brush at the edge
A loaded brush pushes paint sideways under the tape, so work with a fairly dry brush at the line and bring the paint back towards the tape rather than straight at it. Two thin passes beat one heavy one every time.
Pull it off before the paint goes hard
Timing matters more than anything else at the end. While the paint is still slightly soft, pull the tape back on itself at about 45 degrees and go slowly, because film that is still flexible will part cleanly along the tape edge. If the paint has already cured, run a sharp blade lightly along the edge first to break the film, otherwise the tape takes the new paint off with it in strips.
And take the tape off the same day. Leaving it on for a week, especially anywhere in the sun, is how you end up picking adhesive residue off a skirting board with a rag.
Pick a tape that suits what it is going onto
General purpose masking tape is the everyday one for trim and bare walls. A low-tack tape matters when you are taping onto fresh paint or onto wallpaper, because a standard tape will lift a recently painted surface straight off. If a job is going to sit for a while before you get back to it, that is when a longer-life tape earns its money.
Shop related products
- Uni-Pro Masking Tape 24mm x 50m. The everyday width for trim and window frames.
- Uni-Pro Canvas Drop Cloth 1.5m x 3.6m. Canvas stays put underfoot where plastic slides around.
- Utility Paint Brush 75mm Synthetic. For laying the sealing coat along the tape edge.
- Sugar Soap 750ml. Clean the surface first and the tape will actually hold.
There is a lot more in the paint and accessories range online.
Did you know we also stock low-tack green and blue masking tapes in widths from 24mm up to 48mm, plus rolls of masking film with a dispenser for covering a whole window in one go, and most of those never make it onto the website. Give us a ring on (08) 8536 4333 to check what is on the shelf.
We mix and tint both Haymes and Taubmans to order in the shop, so if you are matching a new colour to a wall you have already painted, bring the details in and we will sort the tint from the range we carry.
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I am still the person who presses the tape down twice, because I would rather spend two extra minutes than cut in a whole skirting board again by hand.
Cheers,
Candeece
