Crawley Down Gatwick are still searching for their first win since November following a poor display against midtable Merstham.
The visitors soon pressurised the Down defence when the dangerous Tommy Hutchings’ headed chance forced a save from home custodian Luke Badiali.
For the Anvils newly returned Tom Graves set up a chance for Larry Akanbi.
But other than the odd corner that was to be it, as the visitors started to get well on top of the game as Hutchings struck the post.
Badiali kept out another effort from Hutchings before the Anvils finally conceded on 33 minutes when pacey wing back Sam Tucknott fired against the woodwork before Hutchings pounced to put the loose ball away.
Merstham went further in front five minutes later from a Hutchings corner which crept through a suspect Anvil defence for Tutu Hendrique to squeeze home.
Down playing down the slope, Down’s Omar Lawson broke away from midfield only to fire wide.
This was followed by Adi Akande’s free-kick being turned away by Merstham ‘keeper Brannon Daley.
Looking well in command, Hutchings turned Graves and fired a rocket that Badiali turned over.
The Moatsiders went further ahead after 72 minutes when a Tucknott corner was turned into his own net by Anvil Ade Akande to put the visitors in front with a three-goal cushion.
Although completely outplayed, the Anvils kept going and were rewarded eight minutes before the final whistle when another route one ball found the galloping Larry Akanbi to drive home past the exposed Daley much to the delight of the sparse Crawley Down support.
Crawley Down Gatwick: Luke Badiali, Jamie Hills (Miles Mitchell), Veejay Miller, Adi Akande, Tom Graves, Anton Douglas, Omar Lawson, Bakari Sinclair-Smith, Allan Tait, Larry Akanbi, George Cousins
Man of the Match: Tommy Hutchings (Merstham)