With finecast it is not too bad, but for other companies the paint peels off really easily and is very annoying. How do I stop this? I've heard you can either wash off the oil (how hot water, and will it ruin detail?) or prime it with gloss (will it be shiny?)
Any help?

Warm soapy water and a light scrub with a toothbrush works for plastics, should work for finecast.

One of the first manufactures of resin models recommends vinegar. It was a good tip. I have never been able to get the mold release off of Epicast in one try. For really difficult stubborn cases float the oil off the model in soapy water and vinegar. It could take a week. I use a paint bucket and a cheep kitchen strainer to keep the miniatures from floating to the top with the oil.
No need to use hot water. Warm water will be fine.
Hot tap water will reform finecast.

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"the same as a duck you must be made of wood"

Thanks guys! Finecast wasn't so much a problem. I've got these plastic miniatures that are a real pain. Will your advice work on the plastic ones? They are very flexible (not hard plastic) but very detailed.

Besides metal, I work with soft and hard plastic on a regular basis -- several washings with warm water and liquid soup are sufficient to remove various residues. Good luck.

It should work fine for the mold release.

This will make it difficult for some brands of paint to stick. What does the manufacture recommend?

Spell check strikes again

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"the same as a duck you must be made of wood"