First of all I'll work in a well-ventilated area- preferably outside. Plastic resin puts off a tremendous amount of odor and fumes while it is hardening so you need to go to an isolated location where you don't have to breathe it. Another location might be an isolated work shop or back storage shed that is separate from your house. Anywhere where there is good ventilation with no people or animal pets living is usually fine.
I spread a thick coating of newspapers on the work bench. Spilled plastic is hard to clean up so it is good to use rags or newspapers to cover the bench where you are working. That way, you can just throw them away when you are finished.
Wear protective gear when using resin including goggles, gloves, and a facemask or respirator.
Using water - measure how much liquid your mold will hold. Pour 1/8 cup of water into 3 disposable plastic cups. Mark the water line with a pen (figure A). Our mold will hold about 1/2 cup so we will repeat the mixing process several times.
Spray mold with cooking spray.
Wearing safety gear and working in a well-ventilated area, preferably outside - measure out 1/8 cup of resin and add 6 drops of the hardening catalyst. Mix with a craft stick thoroughly according to manufacturer directions.
Pour into the mold and let it harden to a jelly stage, about 25 minutes. Throw the cup and craft stick away in a trash can outside.
Now, lay your item to be sealed on the jelly hardened resin. Repeat the process. Measure another 1/8 cup of resin, but his time only add 4 drops of the catalyst. Mix and pour into the mold (figure B). Let it set another 25 minutes. This is when you can add a written saying. Be patient, mixing resin so that it sets right can be tricky so start with an easy object to encase.
Repeat the same measurements one more time. DON'T OVERFILL the mold. In all, our mold took 3 layers of resin to complete.
Let mold cure for 24 hours. Top of the mold should "click" hard and not be "tacky" to the touch. If you have trouble getting the mold to release, run it under hot water and carefully push it out. Let it stand in the open air for an hour or two. If you touch it immediately, it may pick up your fingerprints and become cloudy.
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