Gloss White Gaps

Hi everyone, I have just fitted a B & Q gloss white kitchen and all is ok apart from where I have had to cut filler panels. The cuts are straight but there is a gap where they are screwed to the adjoining unit of only 1mm. As the carcasses are white and the panels gloss white they 1mm gaps stand out!! Does anyone have any ideas what I could fill these gaps with? Would Ice White sealant be a good idea??
Any help would be appreciated.