Two goals in six second half minutes saw the Bay lose 2-1 at promotion hopefuls Guiseley in Skril North on Saturday after taking the lead with a 57th minute penalty.
The Seagulls were the better side for over an hour and dominated much of the first half in which Guiseley did not manage a single shot on target, in fact, their only attempt at goal was a 34th minute shot from Danny Forrest which curled wide, Jonathan Royle and Tom Smyth outstanding in the middle of the Bay defence.
Rob Hopley should have scored for the Bay early on when the ball fell nicely for him from a free kick after Royle’s shot had been blocked, but his shot was deflected over the bar off the keeper.
Anthony Stephens, Hopley, James Ellison and Cameron Darkwah all had shots saved by the keeper and Gaz Evans and Jamie Crowther were off target with other efforts.
The Bay did take the lead, however, early in the second half when Ellison was brought down in the penalty area and he scored from the spot.
Ellison then curled a shot just wide of the angle and Sean Williams was narrowly off target with another effort.
But the introduction of Guiseley substitute Oli Johnson on 61 minutes changed the game.
He caused problems with his pace and set up the equaliser for Adam Boyes on 66 minutes as he pulled the ball back from bye-line – virtually the only time Guiseley had managed to get round the back of the Bay defence.
Gavin Rothery then added a second six minutes later when a headed clearance from a free kick fell to him just outside the area.
Chris Sanna had to make two fine saves to deny Johnson further success and although Colwyn Bay pressed in the closing minutes they couldn’t force an equaliser.