I found UVPoxy to be an excellent product.
I had read reviews of epoxy products of many manufacturers. Some were negative. So I looked to the many manufacturer's websites to see which best addressed my apprehensions.
A major reason I chose UVEpoxy was because it's website
had a link to a video:
Understanding How Temperature Affects Resin Viscosity
on how to get a less viscous pour.
I leveled each surface with a spirit/bubble level to ensure the epoxy would flow evenly. Even though I don’t recall seeing this in the instructions.
My major criticism of the instructions is that they say the resin and hardener should be mixed in a PRECISE ratio of 1:1 by volume. It is impossible to measure anything absolutely precisely, especially with the surface tension of a fluid. How precise needs to be specified? What volume matching is required, within +/-10%, +/-5%, +/-2%, +/-1% or what ?