This is for a 2 oz Lace Melting Holding Spray. This spray is for individuals looking to melt or install there lace wig with no glue. This is not lace wig adhesive. It is for daily wig wearers. The hold can last 1 to 5 days. Some have expressed longer. The average hold time will vary for each individual. This product is safe for HD lace, swiss lace, or french lace. This is safe to use in front of your natual hair line for daily lace wig or toupee wearers. This product is not waterproof but it will get you thru some prespiration. It is best to clean the hair line with alcohol and using a skin protector to get an even more secure fit and hold on your lace wig.