Painting Acrylic

Hi,

I’ve been asked to make a pair of signs for changing rooms at a local gym. They want them cut from a grey acrylic which has become a corporate theme throughout. What i’m not sure on is once i’ve carved out the Man and Woman, how am i best to paint in the area? Do i just need to be super carful or is there a trick?

Normally when i’m painting in a sign its in wood and i would use a sanding sealer, paint in and then sand back to give a nice crisp line but if i sand the acrylic is will wreck the surface.

Thanks.