a normally just stick 2 in the top 2 in the middle n 2 in the bottom but av seen people stickin loads in  theres no point in my opinion :-?
cheers for the info gonna give it a try if theres no wait for it setin then cant be badcarpenters use it to fix skirting boards, you can buy it from srcew fix, builders merchants not sure about b and q also wickes do there own version