Unless you have an infection, urine is a sterile substance, so it generally shouldn't cause an infection to use an extended wear or booster pad. The main problem that you might look out for is skin breakdown, which can happen whenever the skin is exposed to moisture for too long. Many high-quality pads are designed to wick the moisture away from the skin. You might try getting a few samples of different brands and types, lay them open and pour about a cup of water on each (make sure you use the same amount for each pad). Wait ten minutes or so and then feel the pads with your hand to see which one has wicked away the moisture the best.