Exhibit
31.2



CERTIFICATION



I,
Richard A. Petrocelli, Chief Financial Officer of Flat Rock Capital Corp., certify that:



1.
I have reviewed this annual report on Form 10-K of Flat Rock Capital Corp.;



2.
Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary
to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect
to the period covered by this report;



3.
Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all
material respects the financial condition, results of operations, and cash flows of the registrant as of, and for, the periods
presented in this report.



4.
The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as
defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:



a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our
supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made
known to us by others within those entities, particularly during the period in which this report is being prepared;



b)Designed such internal control over financial reporting, or caused such internal control over financial
reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting
and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;



c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our
conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report
based on such evaluation; and



d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during
the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect,
the registrant’s internal control over financial reporting; and



5.
The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control
over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors:



a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting
which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial
information; and



b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s
internal control over financial reporting.



|Date: | March
    13, 2019 | By:                                                                                 | /s/ Richard
    A. Petrocelli
|----- | ------------------ | ----------------------------------------------------------------------------------- | -----------------------------
|      |                    | Richard
    A. Petrocelli                                                          
|      |                    | Chief
    Financial Officer andChief Operating Officer(Principal Financial Officer)