Ok, here's my Hellequin mask tutorial, I'm going to replace it, before it was way to out of place, now it's more organized and easier to follow, I hope this is helpful, and if there's any questions, don't hesitate to ask
I was just wondering, did u put the plaster cloth directly on top of the base mask? Did it stick when you tried to separate it? Also, when you added the spikes to the top, did u add them when the mask was dry or did u need to wet the edges of the mask again?
And yes, I did put the plaster cloth directly on top of the base mask, yes it did stick nicely and separating it is very easy and it comes the whole piece of just like in the pic, and I added the spikes when it was dry, it wasn't a 100% dried tho, I did it right after separating it from the base... it was dry but it was still cold.
Primer is a gray paint from a can spray, it's used to blend/smooth and object or even sand paper it, it also helps the paint you'll use over it to stay/resist and wont allow it to peel off or get scratched so easily, and when it dries it looks as if it was rubber.