So, lets begin by looking at basic products for sealing insulation. Why seal insulation? Basically, if you have open seams or butt joints then this is a point of weakness - letting heat out, or cold in depending on your point of view.
Probably the most low tech solution for sealing domestic grey pipe insulation (eg Climaflex) would be a product like Clima-Clips which you simply pinch into place along the seams or but joints - a good rule of thumb would be to use 2 clips per metre along the seams, and 3 or 4 around the butt joints depending on the size of the pipe insulation.
This product is quick and simple to use, but is not perfect as it does of course leave gaps which may be opened if the material is twisted so you must be careful about where and when you use it. Clips tend to work better with thicker material as the seams cannot warp so easily - for example using them on pipe insulation for frost protection in the loft you would not have any problems.