A WET weather Colour Run will help the dyes stick better with finishers emerging as vibrant rainbows, according to the national race director Luke Hannan.
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About 12,000 people are expected to finish the run billed as ''the happiest 5 kilometres on the planet'' on Sunday, and entrants hoping to keep a memento of their stained shirts are advised to spray them with vinegar and iron the colours into the fabric.
The run is not timed and participants are asked to follow only two rules - wear white at the starting line and ''finish plastered with colour''.
''We've run a couple of wet weather races and people seem to go a bit more crazy than usual,'' Mr Hannan said.
About three tonnes of coloured powder will be showered on the runners on the day, turning their all-white outfits - and themselves - into moving, or running, rainbows.
Runners will pass through four colour zones on the five-kilometre route - pink, blue, yellow and orange - where volunteers will throw the colours at them by hand or with squirter bottles.
Volunteer and runner Clair Harb, 27, will be out on the course come rain, hail or sunshine with her three-year-old son Cameron in a jogger pram. ''It looks like a whole lot of fun and I'm volunteering because the charity of choice is Give Me 5 For Kids, which I do a lot of work for,'' Ms Harb said.
Mr Hannan said the coloured powder is made from 100 per cent ''natural and safe food-grade corn starch''.
''You could in fact eat the stuff but we don't recommend it because it doesn't taste that good.''
The run starts at 8am on Sunday from Stage 88 in Commonwealth Park. It will run parallel to Parkes Way, turn near Kings Park and return back into the heart of Commonwealth Park for the finish.
