It was a cheering reward after a difficult weekend for the Indian team, race-developing two of only four independently made machines in a grid made up of fully-fledged over-the-counter production racers.
Schrotter got the better of the conditions that saw falls for more than half of the 33 starters to take the first points for the all-new Mahindra MGP-30 Moto3 machine.
His four points made up for Danny Webb's disappointment. 21-year-old Englishman Webb started from pit lane and was picking his way forward through the spray and past the debris when he too fell victim to the slippery conditions.
Schrotter, a 19-year-old German, started from the back of the grid after problems in qualifying and knew he faced an uphill task. But he showed true grit as he battled sliding tyres and treacherous tarmac to bring the white-and-red machine home.
"It shows that you must never give up. We are working hard to develop this new machine and there is a lot of work to do. But if we all work together we can do it," said Mahindra Racing COO Mufaddal Choonia.
The race, fourth of 17 rounds, was won by French home hero Louis Rossi, survivor of a leading group that was ravaged by crashes.