+1 Wetting Tape before application.
Have a look on YouTube. Clean bike thoroughly, use Meths to finish surface, remove bottle lugs/cable ties etc. Cut tape to rough size, Bowl of water, tiny amount of washing up liquid, drop tape in water, take backing off, put on bike, slide around until correctly positioned, use credit card and sponge to squidgy/squeeze out water. It will stick like sh*t to a blanket when you’ve done this – so make sure it’s positioned. Finally, use a craft knife to trim it off where necessary, especially round bends. Use a burning cigarette or soldering iron to burn out Bottle lug holes.
If nothing else, it does give minor ding/dent protection – it’s quite thick stuff.