[bylo]

Are you sure this will work on light bulbs?

I have two concerns:
1. Sanding a bulb with sandpaper, as well as etching it with the cream, weakens the glass.
2. Cycling the temperature of the glass as happens every time you turn the bulb on or off creates stresses on the glass that, compounded by 1., may cause the bulb to break spontaneously or while handling it, e.g. when changing the bulb.

Be very careful with this solution.

BTW what does the EU have against frosted glass? Here in NA governments are beginning to ban the sale of incandescent bulbs in general, clear and frosted, in order to force us to use more energy-efficient lamps like CFL and LED.