PEEL-RESISTANT SELF-HEALING COATINGS AND STAINS FOR POROUS SUBSTRATES

Disclosed are methods of protecting porous substrates and/or increasing the peel-resistance of coatings and stains for porous substrates. The methods may include providing a stain or coating comprising a microencapsulated self-healing material; and applying the stain or coating to a porous substrate. Damage to the stain or coating may release the self-healing material at a site of damage， such as a crack or scratch in the stain or coating. The self-healing material may be a polymeric precursor， an unsaturated polyester resin or alkyd， a fatty acid-based natural oil or derivative thereof， or a cross-linkable silane or siloxane monomer or resin. The microencapsulated self-healing material may include a microcapsule having a shell wall that includes a thermosetting polymer or a thermoplastic polymer; the thermosetting polymer may include urea-formaldehyde， melamine formaldehyde， polyurethane， polyurea， or polyacrylate; and the thermoplastic polymer comprises poly(methyl methacrylate)， poly(lactic acid)， or poly(glycolic acid).