Is there a way to buy the silicone based coating that humanhair extensions are treated w/ prior to being sold?

Question

As told by a hairdresser: There is a poly, plastic, or silicone product applied to the lower quality of human hair extensions to make them more appealing for buyers, however this washes out after a few washings and the hair then is what people wearing the hair complain of as "needs to be replaced" or "just doesn't look like new" etc...Question: Where can this be bought to re-apply it to the hair so it can then be combed and cared for nicely to continue wear?

Answer 1

beauty supply store