Flooring Vinyl square tiles cracked and broken in places

[bejay]

The floors have vinyl squares stuck to the underlying concrete and work very well for many years. In a few places the vinyl tile has cracked and bits of the vinyl tile is missing showing the concrete underneath. I want to put a new top of vinyl sheet and would like to fill the small depression where bits of the old tiles are missing, what would you recommend to fill the small areas involved, it's only about 2 or 3 mm deep. It was suggested a normal diy filler would do the job but this might break up over time. I wondered what the opinion of others might be.
Thank you

 

[lymmranger]

The correct fix is to scrape up all of these tiles and then to screed the floor with a suitable screed. Be aware these tiles are likely to contain small amounts of asbestos! so technically some care should be taken in their handling and disposal. In reality the risk is extremely low.

as you are going to fit a vinyl floorcovering then again in reality any decent filler should suffice

Be aware that the idea is to end up with a smooth blemish free surface. - any imperfections will probrably show through as vinyl has a nasty habit of moulding itself to any and all subfloor imperfections