Hey wavydream,
I can give you my opinion for your questions, perhaps others can add from there own experiences.
1- alternative for spray.. any other hairspray.. i use finesse and I dont have any white marks problem.
2- Toppik will stay strong in wind if it is hairsprayed in.
3-Sun..yeah its noticable..depends how much you use and how you use it.
4-should only be applied once, unless you have a long day and you've been lying down or its been messed up some how.
5-how long can one application last-I've put it in one day..was out all night..woke up the next day and its still in there.
6-what kind of comb-plastic comb?-I wouldn't think one of those thin barber combs would be good to use right after application, perhaps later on during the day when it has fully settled.
7-shampoo-not really sure about that, there are some threads in this forum somewhere from people more informed on that topic, but I would definitly shampoo it out of your head at night using a very mild shampoo so you can apply your regrowth/maintaining products.
As for application, I'm sure different people have different application processes. I perfer to shake it on and then pat it down, followed by a light comb through with a brush. This helps it get on different 'layers' rather than just on top. The biggest draw back is the sun light or certain lighting situations. All these factors depend on your hair/color/style/gel/etc.
I sometimes use a couvre/toppik combo...turns my hair clock back at least 5 years!! I try not to do that too often. Some people argue that these products give you a false sence of security, which I somewhat agree with, but at the same time I'm gonna enjoy this sh*t while I still can, so those people can :moon:
All in all its a good product for a shitty situation :hairy:
whaddya gonna do.