Use of a prewrap product during a perm is to:

• A. Equalize Porosity During A Perm
• B. Restore Disulfide Bonds
• C. Determine Processing Time
• D. Rinse After Perm

Answer: (A)

Balancing porosity across the hair is essential for even chemical action during a perm. A prewrap product that acts as a porosity equalizer is applied before wrapping to standardize how the waving solution penetrates along the strand. When areas with different porosity receive the solution more uniformly, the hair processes more consistently, reducing the risk of over-processing in highly porous spots or under-processing where the cuticle is less receptive. This helps achieve a more even curl pattern. It isn’t about restoring disulfide bonds, doesn’t set the processing time by itself, and isn’t a rinse step after the perm.