I have a product call Preservo Serum from Avalon Products that's supposed to be used with my Affirm Fibergaurd Relaxer. The product is designed to be used on new growth specifically (and all over the rest of the hair) right before a relaxer to help your hair retain more strength during the relaxing process. The consistency of the product is like a creamy(watery) leave-in so it may work to help lay your hair down.
Here's a product description:
Product Description
Step 1. Affirm Preservo New and Improved Strengthening Serum is applied to hair just prior to chemical services to protect and condition hair during processing. Its applied to the hair to protect and condition hair during processing. This patented formula penetrates deep within the hair shaft while cuticles are open during the relaxing to minimize swelling, preserve strength and restore the hair's natural luster.
I've been using the preservo serum with my Affirm Fiberguard and my hair feels like butter when I wash the relaxer out. Definite keeper for me!