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You can put a small amount of latex in a paper cup and add a tiny bit of DISTILLED water to thin it to the consistency of whole milk. I use this as a first coat to pick up fine detail. But first wet the master pattern with distilled water. Don't add soap because it will cause bubbles. You don't need to thin the latex for the remaining coats, however sounds like your latex it's drying out ( because air is getting to it) or is very old. Better use it up soon. After the third coat I use cheese cloth between coats to help build up the mold and add strength.
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