This guide from Silva seems really useful, but it's not that specific:
http://www.silvatimber.co.uk/media/pdfs/cladding/how-to-install-western-red-cedar-cladding.pdf
It says:
"Use high-performance acrylic-latex, acrylic, acrylic-silicone,
polyurethane, polysulfide or terpolymer rubber...