Corkscrew serve

 Yes, I still don't understand. I will really thank to you if you will make a video for me :)

 Does a tackier rubber make us easier to do the corkscrew serve? is it create more spin?

No it doesn't.

 How about the spin rating in tabletennisdb.com? Does the rubber that rated with the biger spin also creates more spin while serving?

Yes it should.

Jason,

Watch out for the ratings on tabletennisdb.com, or anywhere else for that matter. They are only the average of a limited number of subjective user ratings. Take the Mark V example. The first person rated it with a speed of 8.6/10 and a control of 7.7/10, the second person rated it with a speed of 6.0/10 and a control of 10/10. These are very different values, as if the first guy described and OFF- rubber, and the second a defense rubber. And again, these ratings are subjective and depend on each reviewer's experience. I'm used to faster rubbers, so I would rate the Mark V's speed as slow, while someone who only experienced beginners rubbers and just switched to this rubber would rate it as very fast. Some people also write reviews and ratings after just playing with a rubber for 30 minutes, not even mentionning which blade they had it glued on (which can make a significant difference too). So be very careful, and only trust those rating at all when the number of reviewers is high (the Mark V being a very old and popular rubber, its 139 reviews make the ratings quite trustworthy). Read the reviews themselves, that's more interesting.

As for the manufacturers's ratings, well those are always overrated because obviously, their products are always extremely fast, spinny and with perfect control...

 Ok. Thanks for your info, Jean

I want to ask one more question. Does the tackiness of a rubber completely doesn't make any effect to the spin that it can make? Or it can increase / decrease the spin of the rubber?

I think the full answer to your question is "Yes, tackiness helps creating spin, but non-tacky rubbers can create a lot of spin too".

Tacky rubbers are typically Chinese rubbers. You can literally pick up the ball with them. They usually have very hard sponges. So if you compare a brand new one of these to an old one that has lost all or part of its tackiness, then yes, the tackiness of the new one will allow you to put much more spin than the old one. Then there are the typical European or Japanese rubbers. These are just a little tacky, or not at all, but their rubbers are more elastic and their sponges are usually softer. This elasticity allows the rubber to grip the ball and make it spin without being sticky. Using Chinese or European/Japanese rubbers is a matter of preference. You don't play them exactly the same. Unboosted, the Chinese rubbers are quite dead. Along with their tackiness, it makes them great for serving with a lot of spin. Along with their hard sponges, it makes them very good for passive blocking. But personally didn't like them for looping. They can do it very well I'm sure, juts look at the top Chinese players, but I found that they required much more accuracy, a perfect skimming of the ball, to be efficient. I found the European/Japanese rubbers much more forgiving in this area. They are more lively, so fast ones are harder ton control on serves or in the short game, but I find them much more enjoyable to play globally. A weak point of the Chinese rubbers is that they lose their tackiness if you play is a dusty environment (for that you can clean your rubber between each game), or in a very humid environment (for that, you can't do much). That's true for European/Japanese rubbers too, but to a much lesser extend. Due to their hard sponges, Chinese rubbers are often very heavy too, which I don't like. One great plus of the Chinese rubber on the other hand is that they usually cost like 50 to 80% less than the European/Japanese ones.

I think that's it. Give Chinese rubbers a try. If they suit you, you'll save a lot of money over the years!

 Ok. Thank you very much, Jean!