Hi guys,
When I was in the army in the tropics we used a product called "perigen" I'm not sure of the spelling but thats what it sounded like, its actually sold to treat timber against termites and the like, but diluted down its used to treat mozzie nets and our cams against ticks and mozzies.
An alturnative is to smear a high DEET mozzie rep on all the openings on your clothes, ie: waist band, trouser hems, fly, sock tops, shirt button line and cuffs and collar, but keep the stuff away from your plastics like silva compasses and watch faces and plastinc eye glass lenses, clouds then up like no ones business.
This is just an idea that works well for me...
I hope this helps...
Cheers Karl.