What I could do with this leak?

Best way to fix that is to get a new pop up bath waste kit and replace the lot.
Use plumbers mate on the seals to assist in leak prevention.
Mastic is for muppets

 

I thought Plumber's Mate was mastic. I use silicone these days to good effect.

 

Plumber's Mate is old school now Dave.

And it is a mastic.

Using Plumbers Gold here.

 

Its a Putty!!!!!

 

A epoxy putty, long time since I've used it, is my excuse.

 

At least you can undo a fitting without having to spend the next half hour scraping off the cr*p left behind by those who insist on taking the easy option

Silicone or mastic same thing really call it what you want, you still have to wait for it to go off before you can prove a sink/bath.

Plumbers mate never sets but forms a good seal, may be old school but so is solder

 

Have you undone that nut(with wide chisel) in the middle ? The grid bit pulls out once that is undone.

Mr. HandyAndy - Really

 

Use a 5p coin and a pair of pliers

 

I see your problem bathleak, the slot in that screw is not deep enough to get a purchace on it, I'd saw though the whole waste just under the bath and renew it all, A resipitating saw will cut it like a hot knife throu butter,

 

If you are going to replace it all, try turning the chrome waste with a pair of pliers, seeing if it loosens the screw enough to remove it with a screwdriver.

Grip it where one of the Red lines are.

 

I dislike pop up wastes, they rarely last very long. You will need to replace the kit, and its a relative simple job. Unless the kit tells you to use silicone then don't bother as the rubber seals are more than enough give a water tight seal. Silicone can cause leaks as it often prevents the washers making a good seal with the bath.

 

Leaded????

 

Never