Heat is the Brisbane version of this problem. Paint behaves differently on a child who has been running around a backyard in November, and a painter standing in direct sun for three hours is not going to be as quick at hour three as they were at hour one. Put the table under a roof and the whole booking works better.
The other local habit worth knowing is how much of this trade here is fetes, markets and community days rather than backyard parties. That is a different job, with an open-ended queue and a painter on their feet for most of a day, and it is worth saying which kind of event you are running in your very first sentence.
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Divide your guest list by the faces-per-hour figure the painter gives you, then add a third for siblings nobody counted. Most work to a two hour minimum, so the real question is whether one painter can clear your queue inside it. If the sums say no, a second painter or a cheek-only menu solves it and hoping does not.
A current Queensland blue card in the name of the individual performing the work. Painters who take bookings across the border into northern New South Wales may hold a second state's clearance as well, which is worth asking if your event is out that way. Ask for the card number and look at the card, because a profile on this site is a listing rather than a check.
Cosmetic-grade paint made for skin comes off with soap and water, which is what a professional painter will be using rather than craft paint. Glitter is the one that follows you home and stays in the house for a week, so if that matters, ask for designs without it. A patch test is a reasonable request for a child with sensitive skin and no good painter will mind.
It is a large share of the work here, and it differs from a party in two ways: the paperwork and the line. Queensland schools and councils will want liability cover and blue card details on file well ahead, so raise it when you book and leave yourself room to find a second painter if one falls through. Ask how they handle a queue too, because standing in a Queensland car park waiting your turn wears thin quickly.
Queensland runs its working with children clearance as a blue card issued to a person. Ask for the card belonging to the painter who will actually arrive, sight it yourself before the day, and match it at the door. We list acts here and verify nobody, so nothing on this site stands in for that check.
A Brisbane summer afternoon outdoors is hard on a painter and on the paint. Somewhere covered, a jug of water and a short sit-down between stretches keeps the pace up, and it costs you nothing to arrange.
Half the parties here have a pool or a sprinkler in them, and a painted face lasts about one lap. Either paint after the water or agree with the painter that arms and cheeks are the plan, and tell guests in the invitation.