Has anyone ever applied keratin treatment (brazilian blowout) to new growth only?

i have keratin (qod) treatment on my hair and my curls are perfect. My experience is that multiple applications of keratin take away all my curl so i would like to apply just to the roots.  i have about 2 inches of new growth and its frizzy, puffy and makes it hard to straighten when i blow dry.  If you've done it before, please let me know your technique.  i have marcia teixeira to do at home.  thank you.

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