Newb problem premult

I have a 3d character that I am trying to comp over a background. The character is rendered on black with an alpha.

If I pipe the character render into the A input of a merge node and then the background render into the B input, by default it looks like some areas of the character are screened over the background. Adding a premult node to the character render gets rid of the screen effect but I now have a dark black edge around the character render.

I cant seem to get rid of it. I tried clicking the premultiply check on the read node but nothing happens.

Thanks for any help 🙂

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