Fantastic, the latex arrives next day from FourDRubber and it's gorgeous, like a sheet of balloon skins.

The red colour is just like a traditional whoopee cushion which ties in with Guinness' requirements for the same materials to be used but we have gone for a heavier grade so that it doesn't split or burst when someone, or four people, sits on it.

I got some solvent adhesive to bond the rubber, after initially being tricked by the empty cans on the shelf in the hardware store (Kennedy's in Towcester) into thinking it was lighter than air.

Now to reverse engineer a genuine whoopee cushion to uncover the secrets of it's construction.