Not sure if you've been sorted out yet, but I have some experience. I'm currently buying products to install a resin floor (and repair the concrete first).
Anyway, you need an 'epoxy filler', it's equal part 50/50 resin putty and activator. Mix together as much or as little as you need...and it's as easy to use as one strike filler...literally that smooth.
you can buy this type of thing from epoxy products, watco or a lot of others. If you google 'epoxy concrete filler' you'll find someone.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local