Do keep in mind that while many yoyos do work with RTV silicone products(that includes flowable), there are some that use thin pads and as a result, are not compatible with being siliconed.
Here’s my suggestion:
If you want it, buy it. If you want to be prepared, buy a few replacement response pad sets. At the same time, learn to silicone yoyos as it is not that difficult.
Many of the budget Chinese yoyos I have come with crappy response pads that need to be trashed and then I silicone the yoyo. Some modes, such as the RecRev Sharp, use a General Yo thin hat pad, which is too shallow to hold silicone.
Yoyos that use a sticker response(most often A and D sized bearings) are not able to really hold silicone.
If you’re not sure, if the response gap has a depth of at least 1mm, that tends to be sufficient to hold silicone.