I've heard about people using the concealer "Dermmatch" to blend their own hair and the hairpiece hair when they're having color issues. My question for those people who do this, does the concealer get on the lace base? Can you just rub it on the hair and not have to worry about staining the base? I have an all lace piece and am thinking about trying this but want to know if there are any cautions I should know about.