Treating Mold in Crawlspace - Lumber Koat?

[Matthew Defore]

My pest control company sprayed this mold in my crawlspace last year with a mold killer last year, but I'm not happy with the results. Has anyone ever used a polymer spray product similar to "Lumber Kote" by the Redeemers Group? I'm considering upping my aggressiveness on remediating this issue with something that will cover up the color of the mold so it will indicate better remediation efforts to future potential buyers.  Does anyone have any experience in restoring this type of issue? Pic attached