Just a basic pointer, a product that does 2 completely different things will do them both to an average degree, and a product that only does one thing will\should do it much better.
If you are working for yourself then seriously, buy trade materials and not jo public B&Q\Wicks brand items, and your jobs and customers will be better off for it in the long run, and just price accordingly, as saving just a few quid can seriously damage your reputation if your materials don't stand upto the jobs you are doing, it might say they will do the job, but the rest of us don't use them for a reason.
Sorry if I sounded like I was getting at you, that was not the case mate.
Good luck
