I tried it once Aladdin but never really got it to work as the wax in the metallics is really too heavy. You know what does look great tho, different coloured bulbs. Try a blue bulb with a Glitterball or a Purple metallic and it looks great!
just wondered as my metallic flows better with 30watt spot but looks a bit shyte with incandescent at night if you know what I mean... thought they might look better with LED.
will give it a go with a blue bulb and let you know.