Busted cabover window - UPDATE- Repair complete

I try to take notice of materials used when work is being done , just to learn and compare methods that people use.
When i watched an rv mechanic replace one, he used a gasket and then 3m flow butyl.
As soon as the job was finished, he was able to water test it right away.
http://www.glasswarepro.com/key/3-M-flow-grade-butyl-sealant