I have been using the got2bglued spiking glue I believe it is called to attach down my base. I find with thin skin it really creates a bond I am satisfied with. I also at times use it to attach the front hairline as well. But the front hairline I feel I need a little bit of glue for a better hold. Not sure why, but for the base its great.

Ill use a little bit of glue at the front center of the hairline, and for the side and temple/temple flap areas i will use the got2b.

the other product I use for a sealer is the got2b glued freeze hair spray. I use that on the hairline that is attached with regular glue to kill the stickiness. It creates a barrier. Works rather well. Keeps dirt as well as your hairs from sticking down into the lace. I just dab it lightly. Probably could work with any kind of hairspray.