Zinssers peel stop is a clear flexible bridging sealer for surfaces where peeling flaking dusting or chalking is a problem use indoors or out to form a breathable membrane over questionable or faulty substrates peel stop tightly bonds to old paint and problem areas forming a sound surface for new paint it forms a tough acrylic film that stays flexible and helps prevent peeling by letting moisture escape recommended uses peel stop prevents peeling blistering checking cracking and flaking on wo