Gelatin cannot be shipped outside the United States. Generic unflavored gelatin will work for some, but not all, processes.
The gelatin pour must be able to cool. If you don’t have air conditioning try working in the basement or place the panel on the floor where it is cooler. The processes work best when the room is less than 70 degrees Fahrenheit.
If you heat the gelatin to over 140 degrees you will damage its ability to gel and it will loose its adhesive strength – you should dispose of it and start over. If you cannot control the heating in a microwave the use a double boiler on the stove.