Can epoxy countertops be kashered?
Epoxy is similar to a hardened glue or hard plastic. Accordingly, Minchas Yitzchak 3:67 writes that initially one should not purchase plastic vessels with the intent to kasher them. However if one needs to one could with boiling water.
However, for Pesach one should be stringent and follow the position that it cannot be kashered. One instead would need to cover the epoxy table counters with a thick covering.