Art Pro Epoxy

You could use either Tabletop Pro or Art Pro, however the final thickness will determine the flex. A lot of people feel 1/4" - 3/8" final thickness gives the flex resistance they need. 

We've never personally done that but plenty of our customers have. 

Typically 1/4" but it depends on the volume and air temperature. In small volume applications ( 1-2 oz. or so) you can go deeper but you can risk causing an exothermic reaction where the epoxy begins to generation heat faster than it can dissipate causing it to overheat, crack, bubble and discolor. 

The shelf life of MAS epoxy resins and hardeners is at least one year in sealed containers, but the material can last much longer when stored between 60-90°F in a dry place.  The product should be stored indoors, on a raised surface off the floor and away from exterior walls.  Do not allow epoxy resins or hardeners to freeze during winter storage.  After use, tightly reseal all containers.  With age or when stored improperly, you may encounter issues such as crystallization of the epoxy resin or yellowing of the hardener.  If there is any doubt about the condition of old material, we recommend mixing a small amount in a disposable cup to ensure it hardens before using it for a project. 

It would depend on the size of the mold, Artpro isn't a casting resin so you would need to multiple shallow pours to reach the desired thickness. 

You can  work in a well ventilated space or wear a National Institute for Occupational Safety and Health (NIOSH) approved respirator equipped with an organic vapors cartridge. 

Art Pro is fine for incidental food contact, like dropping and picking up, but we do not recommend using any epoxy on surfaces that will have direct continuous food contact. 

We would recommend using Tabletop Pro which rated at 124F . Art Pro has a Heat Deflection Temperature of 110F which is fine for cold beverages but anything hot could leave an indentation ie. cup ring. If you do get heat indents from warm objects you can use a heat gun to warm the area and smooth out the dent. General rule of thumb with any brand of room temperature epoxy, if it is hot enough to burn you, it can leave and indent on the epoxy!