Profile: Liners Direct is a manufacturer of custom acrylic liners for refurbishing bathtubs, showers and bathroom walls. Our product Mil-Guard™ acrylic liner helps to retain the new-appearance of bathrooms with very little maintenance. The acrylic liner is non-porous and prevents the growth of bacteria. It has a sanitary-grade silicon containing Mildewcide ™, an anti-microbial chemical that resists the growth of mold and mildew.