How to install window film
Before you do anything, get in there and give those window edges a good clean – sugar soap wipes work well for this. Make sure you get into all the ridges and indents – there will be a build-up of dirt and grime in those hard-to-reach spaces. Old toothbrushes also work well on these tight spots. Make sure you don't have any peeling or flaking paint, and if your mullions are unpainted, make sure you apply a primer before you start (we didn't need to, as ours were already a lovely beige colour!)
Sand your mullions down to a flat finish using 180-grit sand paper, and wipe clean with a rag. You want everything to be dust-free and dry before you start painting.
We can't stress this enough – preparation is key! Measure out pieces of either butcher's paper or newspaper so that your windowpane is completely covered and stick them on with painter's tape – make sure you stick the paper right to the edges of the mullion. You'll also want to put down a drop sheet and open any windows (turning on a fan is good too) in readiness for using your Epoxy spray.
This is the fun bit! Spray your mullions with your desired colour – we opted for Dulux Metal Shield Epoxy Enamel in Gloss Black for a nice, modern finish. Before starting, be sure to shake the can for at least two minutes (you'll hear the balls inside rattling) so it's well mixed. Open some windows, pop on your dust mask and you're ready to go! Short, sweeping movements are the best way to apply your spray paint – make sure to hold the can about 10-25cm from the surface. You'll need two or three coats – applying several coats of a light mist works better than one heavy coat.
Peel off the tape and paper once the paint is dry. If you do have any overspray, use mineral turpentine to remove it as soon as possible.
Beige, be gone! Your window is now transformed….