Green and Yellow Frog Tape - BOTH peeled off paint

[stoobloo]

We have one colour on one wall, and a different colour on the other. So masked the 'dry' wall (from 4 days ago) - did a test with green and yellow frog tape on to the dry painted wall.

Painted down both corners of the unpainted walls. Peeled the masking tape off, the newly painted line was okay, but it took off the dry paint! It's Dulux Heritage paint too so no cheapness.

The walls were freshly plastered a few months ago, mist coated twice with white emulsion.

What did we do wrong? It was torn away very gently, but it just pulled the paint off with it.

 

[foxhole]

Do you mean the wall was masked off for 4 days prior to painting? It should not be on the wall for more than 24hrs.

 

[stoobloo]

Do you mean the wall was masked off for 4 days prior to painting? It should not be on the wall for more than 24hrs.

No it was masked off, then painted. 30 mins ish later, tape removed. Carefully.

 

[freddiemercurystwin]

To me, that suggest a problem with the paint rather than the tape, I've only used the yellow once and far from peeling the paint off (which I was concerned with) the paint merely seeped underneath.

 

[opps]

We have one colour on one wall, and a different colour on the other. So masked the 'dry' wall (from 4 days ago) - did a test with green and yellow frog tape on to the dry painted wall.

Painted down both corners of the unpainted walls. Peeled the masking tape off, the newly painted line was okay, but it took off the dry paint! It's Dulux Heritage paint too so no cheapness.

The walls were freshly plastered a few months ago, mist coated twice with white emulsion.

What did we do wrong? It was torn away very gently, but it just pulled the paint off with it.

Why did you mist coat twice?

One dilute coat should be sufficient.

How much did you dilute the first coat? most Dulux trade emulsions recommend thinning by 10 percent.

Unfortunately, there are many people on the internet that recommend watering the paint by much more than that.

New plaster is very porous. If you apply full fat paint, the moisture in the paint is sucked in too quickly. Water based paints cure through a process called coalescence. As the water evaporates off, the molecules shrink down and bond- if you don't thin the paint, the water is sucked in to the plaster and the coalescence fails. If you thin the paint too much... the coalescence fails (because the water is still sucked in). Two coats of over thinned paint do little to deal with the porosity of the plaster (known as "suction"- meaning that the plaster suck in the water).