The video above goes into the following details:
How to felt with resists
When you felt with a resist, you need to lay out the wool on both sides to cover the resist completely. The wool layers need to then go beyond the resist edge, so that some of the wool can be turned over to the other side. This is exactly what allows you to create a seamless object in wet felting.
How to avoid ridges on the resist edge
To avoid having ridges on the resist edge, you need to start working on the “seam area” immediately after the layout. You must also keep your eye on this part of the felt during the whole felting process.
When do you remove the resist?
When the wool is pre-felted, and you feel the resist is already too tight or it's even curling inside the felt, it's time to cut your opening.
Just make sure that the wool is solid enough to be cut. And remember not to cut the opening too big, since holes are the only thing that becomes bigger as you felt.
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