AI am doing a cake for my sister in law to be and she wants me to make the cake shimmer all over, am i right in thinking i just brush on lustre dust or will it be patchy and clump in places? Any advice would be good (i am in the U.K if that makes a difference to the advice or anything lol) :-)

More than likely, yes. Make sure it is grease free if you used shortening or anything like that. Mix vodka in with the dust and paint it on. The alcohol will evaporate and give you a much more even sheen. 

There is nothing like airbrushing shimmer on to a cake. It is fast, less messy and goes on evenly. If you don't have an air brushing system, you can buy it in a can and just spray it on.

AHow many cakes does a can of lustre roughly do? I am doing a 12" 10" 8" but was hoping to do a run through as its the 1st ever wedding cake i have made :-S

I used a can of silver lustre spray (PME brand) to cover a largish silver cake - I'm confident that one can would put shimmer on a 12/10/8. You don't want a thick cover on the whole cake.

Make sure you do something to contain the spray - someone hold a sheet up around the cake while you spray it or take it outside or something. That stuff gets everywhere!

AShe wants a pearl effect on white fondant would sliver be too harsh cos she likes the snowflake sugarflair lustre dust shimmer colour on white

A

Yes.

There is a cake in my gallery that is airbrushed with pearl luster. It is the champagne & white cake. There are also elements with silver luster & gold luster.

AI would just dust with a large fluffy brush, if its too intense mix with corn flour first to dilute it down especially if the cake is white/ivory underneath