Prep 200 Architectural Coating Remover (Gel) Removes acrylic concrete sealers and acrylic (brownish) carpet and tile adhesive. Recommended for use on architectural surfaces such as wood, brick, stucco and masonry. All DuraPrep products NEED TIME to penetrate the coatings and lift them off. Most coatings lift off in 2 to 24 hours. If possible, spray the coating removers on the coating in the afternoon and leave it overnight. By the next morning the job will be done. Allow extra time for cooler temperatures.