Porosity Equalizing Spray ensures even pigment absorption on hair with uneven or high porosity. This gentle- lightweight formula also assists in conditioning and detangling the hair and is designed for use prior to a Kenra Color Permanent or Demi-permanent color service. Gentle lightweight formula Ensures even pigment absorption on hair with uneven or high porosity Assists in conditioning and detangling hair How To Use: Spray in sections and comb through for even distribution. For fine hair- select 1 sections. For medium hair- select ½ sections. For thick hair- select ¼ sections.