Wurz said he had never forgotten a talk he attended as a youngster given by Danish former racer Kris Nissen, who had a fiery sports car crash at Japan's Fuji circuit in 1988.
“He showed his body and said 'look at this',” recalled the 48-year-old.
“For him the absolute most painful thing after fire, and it wasn't a long fire, was the rubber [elastic] in his normal pants being burnt into the skin. He said [it was] for years agony and pain. And it educated me.
“At this moment I said I don't want to live these consequences, only for [not] taking my pants off and putting fireproof underpants on. The same with jewellery.”
Wurz said the GPDA was talking to the FIA about the body's refusal in Miami to shield a concrete wall with an energy-absorbing Tecpro barrier after Alpine's Esteban Ocon and Ferrari's Carlos Sainz crashed heavily.
Several drivers accused the FIA of ignoring their concerns, though the body said it had listened to their advice but decided no changes were needed.
Wurz said hitting a concrete wall, even in a second gear corner, was going to hurt.
A Tecpro barrier could almost halve the G forces and mean a driver would not need medical checks and the chassis and gearbox would remain intact.
That would save money, with teams subject to budget caps, and remove the need to fly a damaged chassis back to Europe, adding to the carbon footprint.
Wurz said the GPDA had been told a barrier was available and could have been installed.
“Strictly speaking we didn't have an injury, so maybe you can say it [the barrier] is not necessary, but we want to say that if we had it, it would improve the situation.
“No research in the world can tell me it would have been a downside to put it [there].”