SA premier joins Vic Lib campaign trail

South Australian Premier Steven Marshall has joined the Liberal campaign on Victoria's election day.

Mr Marshall joined Victorian party MP Tim Smith and federal Treasurer Josh Frydenberg at Kew Primary School on Saturday.

"Wonderful to have SA Premier @marshall_steven on the campaign trail with @TimSmithMP in Kew. Sausage sizzle & cake stall doing a good trade!" Mr Frydenberg tweeted.

Mr Marshall's visit repays a favour to Victorian Opposition Leader Matthew Guy who distributed how-to-vote cards for the SA Liberal leader in Adelaide in March.

"I have a funny feeling I'm going to be doing exactly the same for you come November," Mr Marshall told Mr Guy at the time.

Mr Fryendebrg, whose federal seat of Kooyong takes in much of the state seat of Kew, tweeted images of the trio clad in blue Liberal merchandise.

Kew has been a safe Liberal seat since its creation in 1927.