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Thanks - Did feel like right thing to do but never used before so wasn't sure

Repainting old exterior brickwork - see pictures. Has some algae/mould that I managed to scrape off. Noticed some moisture on bricks under paint in first picture. Not sure if I need to use a fungicidal wash ( Everbuild 404) before I seal with some 406 and paint with Weathershield. Any advice...

Used PTFE tape - leak fixed. Thank you everyone for the help. I let some air into pipes removing valve- any advice on how to get the air out?

Removed olive - pipe slightly compressed - hopefully won't cause problems with new olive

Thanks for the advice - good point. I also have a monument olive removing tool I bought a while ago - assuming it's better than the hacksaw

It is PTFE tape - just removed it. Will clean joint surfaces and put on some new PTFE tape.

I'm trying to figure out if I need to remove this white stuff or put the PTFE over it

Tried backing nut off half turn and re-tightening but that didn't work. Took off valve and it looks like white PTFE already used before. Is that correct? (see pictures below).

Thanks - maybe this is the first thing I should try before removing the olive.

Apologies for my ignorance but what is hemp?

Not tried tightening - thought I might over-tighten and damage pipe. Was planning to drain system before working on olive. Thanks for the advice.

Have a slight leak at the bottom of the TRV compression fitting (see picture) after removing radiator for decorating. Assume I need to replace the olive. Do I turn the bottom compression nut left or right to get to the olive? Any help appreciated. Thanks.

Thanks to everyone for your help - managed to remove radiator not touched in 30yrs without spilling anything. Like Opps said above, I might have twisted TRV valve slightly and there is some moisture from underside I will monitor. Thanks again everyone.

Good news is draining radiator was easy - tricky bit was the nut of the TRV which wouldn't budge with my spanner (didn't have a stilson). Hopefully weeping is just from undone nut and not the pipe.

Managed to undo the nut on the TRV...will see if I have disturbed the pipe on the valve or if the weeping is from the undone nut.

Was thinking of taking TRV head off but wasn't sure if taking off head would disturb zero-setting (valve switched off setting) and let water into rad.

Update. Thanks to the versa funnel managed to drain radiator from the lockshield side (see picture). But not so successful on the TRV side - tried but nut wouldn't budge and felt copper pipe move upward which might be causing a slight weep on the pipe - didn't want that. See attached picture...

I'm decorating and need to remove a radiator. Radiator pipe very close to wall and can't use my plumb tub. See picture. Any advice on how to drain radiator without getting water all over floor? Thanks.

Found some pine slivers - was going to use these even though floor is a birchwood floor. Should I really get Birchwood slivers?

Used sawdust and glue for the smaller gaps. But wasn't sure about using if for bigger gaps or if there was a better way. But you are right, leaving boards with gaps is one option.