Adhesion promoter suggestions?

I talked to SPI, they recommended shooting my single stage directly over my scuffed clear.

I was asking him several times if adhesion promoter would be better and he said no.

.

Promoter No,
Sealer Yes!
PPG has a line called Shopline, I have had good luck with those sealers too at a good price.

I wouldn't chance not using sealer IMO......