Can I put up plaster coving with ''no more nails?

use coving adhesive. from a builders merchants. You'll need a miter square for the corners too. You'll need 2 people to put it up properly. When it's in place, remove the bulk of the adhesive with a pointing trowel and then "finish" the joints - ceiling and wall - with an Inch and a half paint brush, dipped in water. Repeat all along the joints, constantly dipping the brush in fresh water.