The house we moved into has an extremely slippery patio, which unfortunatly is located between the door to the house and the pool. What can we either coat or tile it with to make it non-slippery. We live in Arizona and do not have freeze concerns or major rain concerns. The patio is covered. We think there was indoor-outdoor carpet once laid, as the concrete is very slick. We need to change this immediately to prevent accidents with the kids and the "older" family members.