The tattoo is only as good as it's initial bond. Excessive oil and dirt buildup on the skin can significantly reduce the life of your temporary tattoo. Clean the area where the tattoo is to go with soap and water. A gentle skin exfoliant to remove any dead skin is recommended but a washcloth will also do in it's place.
Watch the Hair
Avoid applying tattoos to overly hairy areas. Hair can hinder the adhesive from forming a solid bond with the skin. I wouldn't go as far as shaving the intended area but as a general rule of thumb try to avoid hairy areas.
Sweat the small stuff
Timing can be key. Don't apply your tattoo before a workout or any period of physical exertion. Perspiration can significantly reduce your tattoos lifespan. Large amounts of sweat have a tendency to work the adhesive loose and start premature flaking of your tattoo.
This might seem like a no brainer but avoid placing your tattoos on areas of the skin that crease (Joints) or experience high amounts of friction. Elbows, bottoms of feet, and inner arms.
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