I tried the blade buffing technique with my Merkur 38c and a Persona. I only did it on some spots where I tend to get spotty results (i.e. I miss random hairs because the angle of the face changes over a short span or the direction of the hair changes over a short span) such as my upper lip, corners of my chin, and besides my adams apple. It worked great. I can tell I still have some technique improvement to go but I was pleased with the results. I little irritation in a couple spots but not what I'd consider full-on razor burn.