Step 1. Make sure you clean the glass window with a mineral cleaner, not glass cleaner.

Step 2. Totally mask off any surrounding areas you don't want the frosting spray to go on to. Cover all furniture with covers. This is common sense really, as you will be spraying inside.

Step 3. Mark out your pattern and then, using the 6mm 1/4" masking tape, place this down on the glass as per your pattern. When the masking tape is removed, these 6mm strips will be where you place your sticky-backed lead.

Any areas you don't want to be sprayed within your design should also be covered with masking tape.

Step 4. Make sure you follow instructions on spray can and then start to cover the window with the opaque frosting. We sprayed over and over the windows, allowing drying time between coats, since we wanted to obscure the view of the shed but this is purely a personal decision and entirely up to you.

Step 5. When the spray frosting is completely dry, then carefully remove the masking tape.

Step 6. Once removed, fill in the revealed lines with sticky-backed lead. We did this by deciding which way would have the least amount of overlapping or cutting and trimming the lead. You could be extremely clever and cut each piece to fit perfectly but if you look at real leadlight windows, the beauty in them is the bumps over the joins.