Among veteran foam sprayers, there is also a sneaking suspicion that inexperience is playing a role in the current shuttle situation.
You can learn a thing or two if you spray a few thousand roofs.
"We're processing hundreds of thousands of pounds of foam a year," says Thomas Tisthammer, a roofer in Fort Collins, Colo. "I think I could do it. You bet."
Lockheed Martin is accustomed to such bravado.
Marion LaNasa, a company spokesman, says he receives e-mail messages every day offering solutions to the foam problem.
It can be a little exasperating.
A man that LaNasa would only identify as a podiatrist recently sent a sample of foam sold in a spray can, proposing it as an alternative material.
"What we're dealing with is an incredibly complex vehicle in an unimaginable environment that cannot be duplicated on Earth," LaNasa says.