Not the most glamorous of projects but an essential one particularly when the pipes run down the corner of a living room. Rather than butt two pieces of MDF together which look amateurish and unsightly I carry a stock of edging pieces that I machined out.
It also means that when the customer paints the box there is no rough edge.
The edge of MDF acts like a sponge so you never quite get that perfect paint finish.The edging piece covers that.I was undecided about wrapping the coving around the box so instead left the box as is.Once it is painted it will blend in.