Hi there, I am a complete novice here looking for some purchasing advice re resins for a pure white worktop. 

I have looked at the glasscast 3 and the ultracast xt as options for this project but would like some advice on which is best as a worktop resin and what would work best for my situation.

The worktop I am covering is a cast concrete worktop i made about 3 years ago. It's super solid but it's not completely flat and due to bad preperation, some areas sagged after drying meaning that in areas it's 4 - 5mm lower than it should be. I wanted to use epoxy resin over the current worktop for its self levelling properties and for a bit of fun. I think the glasscast fits this well but am worried about the low heat resistance compared to the ultracast xt. Is this worry unfounded and has anyone got experience working with both of these?

Any help is greatly appreciated.

kind regards