Want an antique look? Add a stylish flare to wood, metal, paper, mirrors etc. The thicker the application, the greater the cracking. Drying time will vary due to application thickness. Cracks may take several days before developing fully. Do not tamper with drying by speeding up or slowing down the process. Once dry, use a final varnish for protection and highlighting cracks. If you would like ta matte finish, you must use a gloss varnish first or you will obtain a frosted appearance. Apply crackle medium with a brush.