I find davlyn black glue works the best for any activity including underwear swimming. I get a really good hold from it and it lasts a week. davlyn green works for some better then black does. Its best to try each one.

When I had a long hair system I found the life span was a lot less. I get 4-6 months out of a system with 4 inch hair. With my 8-10 inch I had 3 months. I had to pay a lot of attention to things that could snag it. Like hiking and twigs! Also I had to go with 75% or lower density or it was ay to heavy. When I knew I was going to have a busy week I would always go blue liner tape.

I always go all lase but I use a product to make a lase protector. Its called fabric fusion. Its too shiny to put up front so I make a horseshoe. A poly prim' would help the hold I'm sure. I just could not stand it folding where it dint fit my head shape.