Architecture Puzzler #237

Glenn Murcutt of Australia was the 2002 Pritzker Architecture Prize recipient. He was the first Australian to win the prize and one of many winners from an English-speaking country since the first prize was awarded to Philip Johnson in 1979. Twice the award has gone to native Spanish speakers (in 1980 and 1996) and twice to native Portuguese speakers (1988 and 1992). Who were these four architects?

What are the three parts in a three-part sealant?