The beauty of lace wigs is the natural appearance of the hairline. This is the part of the wig that must be preserved, or the wig is useless. After repeated washing, combing and brushing, strands of hair fall out one by one. Over time, lace wigs can become so thin that many consumers think they have to discard them. If you have a lace-front wig as opposed to a full lace wig, however, you can sew it onto a weave weft for added thickness. Full lace wigs do not allow for thickness additions. With full lace wigs, you can only add length with weave wefts sewn beneath the hairline in the back.
Purchase wefts of human hair weave identical in colour and texture to that of your lace wig.
Place the wig wrong-side up on your head. Part your hair from ear to ear using the back edge of the exposed lace as a guide. This part is where you will sew your wig down to cover the weave wefts that will be sewn in later.
Remove the wig. Clip down hair in the front to separate it from hair in the back.
Make four vertical, equal-sized parts in the back of the head. Braid connecting U-shaped cornrows using two sections of hair at a time. Equal-sized cornrows in the back are important, because this is where the weave wefts are sewn in.
Start by braiding sections of hair closest to the ears down, and connect them in an upward braid with hair in the adjacent section. All your parts will be visible when this is done.
Make cornrows in the front going back to meet the upward cornrows shooting up from the back. You can part anyway you like as long at the cornrows are going backward.
Sew loose cornrows together along your horizontal part to create an anchor track. This is where your lace wig will be sewn in.
Sew in your weave wefts horizontally across the back of the head until the entire back of your head is covered up to the anchor you made in the horizontal part.
Place your lace front wig on top of your head. The back of it will line up with the braid anchor because you used it as a guide in Step 2 to make your part.
Sew the back of the wig onto your anchor. Blend the wig hair into the weave hair with a brush.
Lift up the front of the wig and secure it to the scalp as you normally would with either glue or contour strip tape.
Apply oil sheen and hairspray as needed for a smooth finish.