For my artwork I only use Epoxy resin. But within Epoxy resin there is also a large variety of brands! Some cheap some very expensive. Not to mention shipping to the Shetland isands!
I have found the brand Art Resin to be the best if you wish to clear coat a painting for example. It has all the properties (which makes it expensive) such as UV stabilized (so wont go yellow) and easy mix ratio e.t c but can be very bubbly and slower to dry than others.
For casting into molds I have found Eli- Chems master cast the best!
It is very quick drying compared to most, crystal clear and not too bubbly! Also easy equal parts mixing. Some resins have to be weighed to calculate complicated ratios for mixing.
For making coasters or place mats, Eli-chems ultra cast is definatly the best as it is heat resistand to 90 degrees!
All can be bought easily online.
I have been delighted to have my artwork feature on the front page Eli-Chems facebook group of 20K members!