Thank you for your reply, this does seem like this is the case, tried to get as much out of the concrete as we can and fully covered it. Luckily...
Just put vinegar down on garage floor and all this came up so definitely not pen.
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No, its right next to my garage and looked at floor in the garage and the concrete is full of it but nothings leaked so just clueless as to what...
It seems like a reaction to something but not sure what, started coming through an hour after being fitted, but people who fitted it don't know...
New vinyl has blue ink spots but isnt it, no one has any answers so any advise would be appreciated.
