I have the Finishline decals and meatballs.
If you clean the paintwork and use a spray water bottle and mist it on you will get good contact. Wipe out all bubbles and air.
Do the air and bubbles again the next day prior to driving. They have been good down the main straight at Wakefield Park raceway at 180 no problems.
Keep the sheet to place the decals back on when not on the car. Also store them flat.
Enzo and Paula at Finishline are good to deal with and I have purchased a lot from them over the years. Always delivered on time and well packed.
Bernie