OK to self-level WarmWire over felt?

[arbuckle]

I am about to install a 200 Sq ft 240V Warm Wire kit using the self –leveling mortar bed over a framed floor. The area previously had a linoleum floor that was glued to a ¾ plywood surface. After removing the linoleum, there remains a thin layer of grey felt material. This material is about 1/32 thick and firmly adhered to the plywood underneath. I have tried scraping the felt off, but the only way I can remove it entirely is to actually scrape the top surface of the plywood with it.

Is it acceptable to go ahead and apply the wire and self-leveling mortar over the felt?

By the way, I plan on using a thin-set material to apply the orange Ditra product over the self-leveling compound once it has cured, followed by another layer of thin-set and a back-buttered natural stone or slate.

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[Christopher]

You'd want to check with your self-leveling manufacturer to see what their stance is on bonding to that felt.
As far as the WarmWire itself, as long as it ends up in that mortar, it should be fine. We just don't know how the self-leveler and the felt are going to work together.