If you’re going to silicone the DM2, you need to do a bit of preparation. Scratch up the inside of the response groove with a pin, needle or even a tiny wire brush. This just gives the silicone more places to grip in to. When I siliconed my DM2, the stuff tore out rather quickly.
If you scratch up the response groove, you’ll be fine. As for me, I’m sticking with response pads in my DM2’s for the time being.
Please keep in mind I’m a big fan of DIY, especially when it comes to yoyos. I’m also very much a fan of using flowable silicone whenever you can for a response. I just siliconed my Matterhorn Avalanche and an older Gnarwal last night, and I’m anxious to get back to playing those. But, I have found that flowable doesn’t seem to work for me as a response system in off-string yoyos.
As this is your first silicone job, be prepared for it to not go too well. Worse case is you peel it all out and try it again and you’ll do better the second time. Just remember to take out your bearing, remove excess silicone and be patient and you’ll be fine. Applying silicone is a skill that will take you a few times to get good with. What I like is that you’ve already got the product and are ready to give it a shot. That’s most of the equation right there.