Do I sense doubt?

Read about the effect of 'shimmering mexican waves' on wasps here: http://www.sciencedaily.com/releases/2008/09/080909204550.htm

Alternatively I could propose Vick's chest rub which has anecdotal evidence as an effective wasp repellant. Just rub it firmly into the observatory eaves. Not so glitzy but it might warm things up.

Cheers

Richard