are kept in hot or humid conditions they will not keep as long. once they are applied, the temperature and humidity won't affect them. these covers are not meant to be a perfect match to all skin tones and types. they are an easy and convenient way to cover your tattoos with no mess or hassle. they are both waterproof and comfortable. if you need them to blend in better with your skin tone because you are using them for a special occasion, several of our customers have used foundation over the cover to make it match their skin better. this also gives a smoother appearance and covers any cracking. 