Spalding businessman Andy Molsom claimed two podium finishes in rounds nine and 10 of the Caterham Graduates Championship at Brands Hatch.
Qualifying went well with two third-place starts but a torrential downpour made for a wet race.
Molsom make a good start from the grid to maintain his position as he set about chasing the leaders.
The lead pair were fighting for track position at every corner on a drying track with Molsom sitting and waiting for his chance.
However a red flag due to a car in the gravel at Paddock Hill Bend prevented any progress as Molsom finished the race in third.
The second race was closely fought from the off and Molsom was up to second but he again finished in third, only two seconds behind the leaders.
He said: “Brands Hatch is a great circuit with a high work rate as there are no real straights.
“Paddock Hill Bend is certainly a challenge every lap, especially in the wet.”
Molsom made it three podiums out of 10 races this year and the championship race is getting tighter with three drivers recording three wins each.
It looks as though it will go down to the last race in Spa-Francochamps in Belgium.
Molsom added: “It was a good solid weekend. To be in contention, I have to concentrate on race wins for the final six races of the year.”
The next meeting is at Oulton Park in Cheshire on August 6.