Contact Us For all your fiberglass repair, custom painting, and mold manufacturing needs, John’s Custom Fiberglass is here for you. Visit us today and see why we are the best fiberglass service in Austin, TX! Business Address: 15390 W. Hwy 29 Liberty Hill, TX 78642 Call Now ! 5127786983 Business Hours Mon-Fri 8:00am-5:00pm Find Us On: Your Name (required) Your Email (required) Subject Your Message Please leave this field empty.