From the manufacturer:
These glossy glazes have nothing to hide. They are great for showing texture or design.
Opulence Glazes are thicker than most glazes and are therefore more forgiving before fired. They can be rubbed, sanded and scraped without adverse affects. In liquid form, Opulence Glazes can be dipped, poured, sprayed or brushed without the addition of deflocculants, binders, etc.
All Opulence Glazes are Lead and Barium Free, Food Safe, Dishwasher Safe and Microwave Safe.
Although Opulence Glazes were designed for C/6 electric firing, customers have reported successful results in gas or wood kiln as well as at various temperatures and conditions. We do recommend thorough testing under your circumstances to assure good results.
