Marking guides are supplied for guidance only. Ideally property should be marked on a dry day and your items should be clean and dry. Remember the more places you mark the better.
Avoid electrical contacts and anything that gets very hot such as the exhaust manifold on vehicles.
Keep a damp cloth handy for spillage during application, once dry the glue cannot be removed.
When security marking anything, it’s important to prepare surfaces correctly and avoid surfaces which may spoil appearance of the item or moving parts such as lids, flaps or handles. Have a damp cloth to hand in case of spillage.