PORTLAND — Preston Haynes is working on the final design of a mask that allows the wearer’s full face to be seen and doesn’t fog up.
Haynes, a former maker of aeronautical parts, has been tinkering with prototypes of the face mask since March when the coronavirus was declared a worldwide pandemic.
“I thought, ‘How can I make a good mask that people would want to wear that showed your entire face and you’d still feel protected?’” said Haynes, who worked in Long Island, New York, before moving back to Maine a year ago.
“It has come a long way,” the Portland resident said.
Haynes has made half a dozen prototypes, including the first that looked like a space helmet. Although there is a “big sense of urgency” for masks and face…