just a reminder, on cleaning the scalp,
WARNING!!!

don't be to aggressive, if you overdo rubbing with say cotton wool or youre finger nail or

especially the hairline if you expose,or not

you might release plasma(clear component of blood which reacts to skin damage etc.) if you damage the surface of the skin,
you've seen this clear fluid in blisters, burns ect...

and you wont get any bond till this area heals.

I made this mistake on my hair line a few summers ago,

and had to stay indoors as the hair line was scarred and had bledd, no way would 2 " of hairline stay secured it just flopped up,.

so that was a lesson for me, hiding away on a beautiful sunny day,

of course although undesirable its not the end of the world on partials if its the crown or forward point before the hairline where it occurs. wheres theres a lot of surface area left to hold abond.

with full systems the nape and front hairline sides, just go easy on visible areas where a great edge bond is crucial

happy bonding,

anty )

so [possibly if you cant get a bond, maybe youre releasing plasma and TEMPORARILY affecting the bonding properties of adhesive.