Path > Do It Yourself > Frequently Asked Questions > Topic List Search For: In: Products FAQS Projects Press Release News Contacts Other or Select a Wallcovering/Surface Prep question: Ready Patch® for Exterior/Interior Work Shieldz® Needs No Sizing Shieldz as a Primer for Paint Shieldz Under Lining Paper Only Follow Wallcovering Manufacturer’s Spec DIF® Safe For Sewer or Septic Tank Proper Wall Prep Before Priming Preventing Wallcovering Primer Bubbles Excessive Pressure Can Cause Edge Lifting Surface Cleaning Shieldz is Self-Sizing Only Shieldz Needed for New Drywall Pet odors