I do believe that the the sealing of the gaps is highly efficient at reducing heat soak, however I would also refer to the procedure as insulating.
Michael/Viper, showed your document to my Lotus distributor to help me with, as it's there for it's first servicing. It's 30C here daily, with high humidity, so you can imagine I'll appreciate any benefit it brings to the Europa (although the Europa has quite a bit more insulation on the sills/ engine already)
Just wanted to say that you and your document are a treasure.
Lotus Europa S 225, Nightfall Black + AP's + Larini + LSS Wheels
Honda CRX Del Sol, Mazda RX-7 FD3S, Toyota MR-S +turbo