Question about Diamond Spray

I just ordered the SRD modular paddle strop, and I have no idea which strop *pad* I should put it on.
I have 2 hard wool felt
1 Piece Straight Razor Designs Premium 1 Leather
1 Piece Straight Razor Designs Scrub Leather
And 1 Straight Razor Designs 15 Carat .5 Diamond Spray

Sorry for the dumb question, I'm just a little lost and don't want to mess this up.

Thanks everyone!

Hi,

Diamond sprays are normally used with the hard felt pad.

Have fun !

Best regards

Russ