Glueing table tennis rubber

Yes you need to remove all of it. I normally just rub it off using my thumbs. Another way is using using some left over rubber (i.e. from when cutting the rubber) and rubbing the top sheet against the old glue.

Edit: Providing that we're talking about water based glue.

guni4you said:

Thanks.What will happen if i glue the rubber when the old glue is still a little bit on the blade?

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You may have an uneven gluing of the rubber, bumps, bubbles, and your shot will be completely ****ed up.

I remove old glue using a little piece of rubber or something like that. Your fingers can get sweaty and not remove the glue residue properly.

No purpose with glueing new rubbers if you do not Do it properly i think. Almost like a waste of new rubbers.

guni4you said:

does it make a difference if i apply 2 or 3 layers of glue on the rubber and 2 layers of glue on the blade?

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Yes, you'll most likely get uneven layers and mess your shit up.

Just do one layer on blade, one layer on rubber, use a fan to dry it until it's completely dry to the touch and glue. You'll be a-ok.

Just make sore to carefully roll out the rubber onto the blade and not just drop it on there or you'll get bubbles etc.

There are many videos on how to glue a racket. Try to watch them!

Here is one video, if you need it: https://www.youtube.com/watch?v=IBVgYVcCVH8

Usually the glueing process is not too hard, just make sure that you distribute the glue evenly on both the sponge and racket. On the racket, make sure that there is glue all the way at the edge, so you do not leave dead spots with less adhesion. Also be fairly quick when you distribute the glue. It dries pretty fast and if you are not careful you may get lumps. Sure you can just remove it if this happens and start all over again, but it is messy

I actually do not like the cutting process. Even after doing it so many times, it is still weird cutting expensive rubbers. Just make sure that you cut flush with the racket edge, do not tilt the scissors or cutting knife. Otherwise you may risk no overhang at all with an "inwards" edge. IMHO it is better to have a tiny overhang for protection.

Besides this, I have given up on cutting a nice edge. It gets jarred anyway, either with scissors or a sharp Swann-Morton knife. I know it doesn't matter, just a mild OCD I find sharp textile scissors the easiest option.