Kilmount enjoyed most of the first-half possession but still managed to go in a goal down at the interval. John Rooney's long punt after seven minutes struck the Blanch crossbar.
Two minutes later Gareth Nolan's glancing header just drifted wide from a Mickel McCabe corner on the left. The away team took the lead on 12 after their first attack of note.
Jay Moore forced a corner on the right and Deco O'Connell's cross sailed straight to the net from the right-hand corner flag. The home side continued to press and were almost rewarded in minute23.
Paddy Peppard's corner was met by the head of Stephen Finnegan and it seemed to scrape paint before going over. The same two combined again two minutes later.
On this occasion Peppard's free from the centre circle found Finnegan free on the left post, but again he fired over.
With six left in the half Stephen Ward sped down the right, his cross fell to Adam Louth who missed the target from close in. One-nil at the break to Blanch.
Kilmount continued to press after the restart but stout defending from Pat Palmer and Eric Duffy held them at bay.
On 71 they almost doubled their lead.
John Fearns won the ball at the back before playing it long to Stephen Hand. Hand lifted it through to Liam Glennon who just got there ahead of Stef Hoey but his effort went over.
Trevor Kennedy threw caution to the wind for the final minutes but as often is the case, the opposition gained the advantage. In minute 87 Palmer's long punt found Hand free and he settled himself before finding the net.
Then in injury-time Glen Morgan's low cross found Glennon who poked home a third from close in to give Blanch the points and continue Markey's impressive run as new boss of the outfit.
Kilmount Boys: Stef Hoey, John Rooney, Keith Ward, Danny McGuinness, Stephen Finnegan, Paddy Peppard, Gareth Nolan, Darren Burke, Paul Burke, Mickel McCabe, Stephen Ward. Subs: Kieran Johnson, Damien Healy, Adam Louth, Trevor Kennedy.
FC Blanch: Jay Reid, Glen Morgan, Keith O'Donohue, Patrick Palmer, Eric Duffy, John Fearns, Stephen Cunningham, Dane O'Connell, Liam Glennon, Jay Moore, Declan O'Connell. Subs: Colm Roche, Stephen Hand, Jay Mahony, Daniel Conroy, Gary Donegan