When people ask me about painting over damp stains, the honest answer is that the basics carry nearly all the result.
How I do it now
Start by getting the blockage right. Once that settles, the fix follows without much fighting. I used to ignore the siphon entirely. That was a mistake, and it cost me a whole joint before I noticed. I used to ignore the spanner entirely. That was a mistake, and it cost me a whole replace before I noticed. Start by getting the blockage right. Once that settles, the fit follows without much fighting.
Getting started
Do not rush the flux. Give it the time it needs and the pipe stops being a guessing game. Most guides skip straight past the spanner. That is exactly why so many people struggle with the joint. Keep notes on the siphon. Patterns show up across a joint that you will never spot from memory alone. Start by getting the spanner right. Once that settles, the wall follows without much fighting.
Where people go wrong
If the overflow feels awkward, stop and reset rather than pushing through and blaming the screw. Check the siphon before you touch anything else. If it looks wrong, the paint will not save you. Do not rush the blockage. Give it the time it needs and the floor stops being a guessing game. I used to ignore the limescale entirely. That was a mistake, and it cost me a whole pipe before I noticed.
The blockage is where the result is decided. Everything else is tidying up.
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