Moist surface on the rubber.

I am no physicist, but maybe the moisture is in your bag/bat case and then starts evaporating when you play? Keep your bag open at home and let your bat dry for some time after playing before putting it into the case.

What i have found is that if the bat is colder than the air around it, especially if you are sweating a lot and are heated up, the rubber surface seems to get wet more often.

To speak physics the warm air around the bat can hold more water than cold air. The air loses its water as it gets cooled down through the contact with the bat and the bat surface gets wet.

You could try to keep the bat at the same temperature at all times, for example use a isolated bag for your racket.

This is my view on it, but i am by no means an expert on the topic

@Der_Echte ... I remember you telling me that you had some solution for this condition ... can you please help the OP out ?

I would agree about the part of bat being 15 or more degrees colder... will play like crap in that situation. However, OP says he has issues after an hour... by then the rubber and sponge are same temp as the room.

COULD still be a humidity issue... maybe not.

He might also have a dead sponge in a few places...

Maybe his glue job is undone...

Maybe the hall is dusty grimy and stuff gets on the ball... or bat.

Cold be a number of things...

I am not there to see his rubber and play conditions.

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Moistured sponge for grip /and blade for overall feeling/ could be a big problem, but maybe its not the case in your situation.
The rubber may loose grip if the moisture is well visible on it as a water film. If not visible, a little portion of moisture is not a problem, but on a contrary - it helps grip and spin.
And if humidity in the hall is normal, than the problem is elsewhere - maybe fat and dust melted with sweat and fixed on the rubber.

What cant be cured must be endured. Sorry.

Some chemical dessicants may be of help, may be.

high humidity venue will always have this problem and has been so for as long as I remember.
the venue needs to put in dehumidifiers.

It is common for people to use silica gel packets and keep them in the bat cover, especially in high humidity countries, but that doesn't solve the issue when you playing with your bat and after an hour later (as in OP) the surface is affected.

Blowing it dry (with a fan, or aircon) are options you can try.

den_gode said:

could booster make this problems worse? Releasing some kind oil through to the outer rubber?

Click to expand...

I have the same problem every winter. We play in a unheated hall and 16 degrees would be cozy. I had the problem with unboosted rubbers and don't think the oil will penetrate through to the top of the rubber. If the booster is applied real heavy and sloppy and soaks the whole sponge then you might get problems like bubbles or delamination between the sponge and the top layer.

I have no answer to the loss of grip other than it is a temperature and moisture difference and yes, indeed it is a pain in the arse. We do have the technology of monitoring and reading the atmosphere in a hall, we could also arrange a remote reading of it , we could then build a small container for our blades that can mimic the condition in the hall. We would then be able to walk into the hall and our blades and rubbers would have the same moisture and temperature . This would be fine for a hobby player like myself but it would all go pear-shape when you play tournaments where after the blades have been scrutinized disappear into some big brown envelope etc etc .
Life is hard 🤣🤣🤣