Not sure what you are using. You can try a sample and see. We use trowels for Italian Plasters.
Doyle

Hi,



First make sure that the blade edges are sanded smooth to remove any nicks or burrs. #600 grit sandpaper is good for this. Place the paper on a rubber sanding block for better control and less fatigue. Sand the edges both before application and also before burnishing.



If you are using a "store brand" synthetic VP then you are burnishing after the VP has set.

It will not matter what type of metal you use to burnish with, as you are just rubbing metal against your acrylic finish.



To prevent the swirl marks you will need to either:

1) Use #600 grit sandpaper.

2) Use a plaster that will allow burnishing before it is set or hardened.



The above does not apply to lime plasters, they have different characteristics.



David

I should have said above: 1) Use #600 grit sandpaper to burnish the finish.

Ronaldo,

There is no easy answer for this problem.
But, if you let it harden even more than you did before, it will make it "more difficult" or even impossible to burnish with a steel tool.

A harder finish will require SANDING in order to burnish.

David