S
Spud
That is quite a heavy residue of glue ,most companies recommend getting as much of it as possible removed before you use a grit primer or SBR slurry the only company that guarantees their products over bitumen cutback is Ardex and they would say to clean/ remove/ scrape as much as possible before lay texting over it with Arditex NA if it was my job I would grind off the the glue with a cup wheel and dust extractor and then tile itas normal
