Multilac wall putty is acrylic water based putty for filling blemishes, cracks on masonry surfaces and patching up surface imperfections on plastered walls with a extra adhesion. It is specially formulated for leveling of minor surface irregularities up to 3-4mms. It is only recommended for interior application. Multilac wall putty is acrylic water based putty for filling blemishes, cracks on masonry surfaces and patching up surface imperfections on plastered walls with a extra adhesion. It is specially formulated for leveling of minor surface irregularities up to 3-4mms. It is only recommended for interior application.