Use Ghost Bond!
I have used many products. This is the best. It dries clear and holds very tightly. Sweating, heat, working out.....no problem. This is the best hair bond that I have ever had for my lace fronts. Worth every coin. Dries very quickly. I would recommend this to anyone. Didn't pull my hair out and removes easily with alcohol and a cotton ball. Apply 4. Thin coats and spread out with a small paint brush. One coat every 30 seconds. The last coat, let it dry for at least 10 minutes and apply your unit. Wallah....it's like magic.