Crown Green Bowler Discount Centre offer every Grip, Polish and Sheen available to bowlers. The whole purpose of these products is to provide a better grip of the bowl, thus more control, and therefore more accuracy. This is either achieved by making the bowl shiny or sticky, for example Grippo is intended to create shine and Wilgrip to make hands sticky (transfers to bowl).
The trouble with a sticky bowl is that it picks up debris (dirt & grass) as it rolls, and ends up looks like a hedgehog. That is why products that produce shine and are not sticky, like Crack-a-Jack, Winwax & Monkey Grip are so popular (they also smell better).