If your blade has lost a little sharpness then 10 laps or so on a pasted strop could indeed be a solution.

I personally recommend Puma chromium oxide paste, but any high quality razor grade chromium oxide paste will do.

If you only have one leather strop, then I wouldn't recommend that you paste it. A cheap solution is to paste a flat piece of balsa wood which you can find in hobby shops.

Good luck!