Smooth plaster line around door frame??

[hashamyim]

So, probably quite a simple question - in my parents' house, the plastering around the doors covers the corner where the frame meets the wall and leaves a neat line about 2-3mm from the frame edge (please see attached pic).
I have tried it in my flat using masking tape, plaster and a standard sanding-spatula but it doesn't look very good...
How is this achieved?! Thanks in advance!

 

[Rodders53]

Decorators Caulk.
A type of flexible mastic.
Applied from a tube using a gun and smoothed with a tool or slightly wet finger. The better stuff overpaints well.

 

[hashamyim]

Oh brilliant - thanks! I guess the straight line is created using masking tape?

 

[Rodders53]

Skill and/or practice.

Tape will be more likely to leave a mark or ridge. But you can experiment.

 

[opps]

The problem with caulk is that is shrinks back.

Presented with a door architrave that almost butts up to a wall. I would use a filler such as Toupret Tx110 to fill up to the architrave. Sand it and then prime it.

I would then apply a soft filler such as Toupret Redlite where the architrave meets the wall. The reason being that it is so soft that you can use a much finer grade of sandpaper to sand it back, and hopefully, not end up cutting in through the TX110.

If the gap is only a couple of mm, yeah, use caulk. My go to is Everbuild 125.

 

[hashamyim]

Hey all! Thanks so much for the help. Have just finished the final doorframe and it all looks brilliant!