10 years coal mining, 25 years teaching, 10 years Head of Faculty, now retired...
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If you're going to continue locking in the same way, any 'proper' remedy will deteriorate in the same way.
Kurust would probably be cheaper than Rustol - dries blue/black/purple in half an hour or so, water based so easy to clean brushes etc. Probably not as effective as Rustol Owatrol but dead easy to daub a bit more on when new chips appear?
I've never owned a hand held circular saw - didn't borrow the multi tool for it's sawing capabilities, but was still impressed by it's plunge saw option for cutting across single floorboards. It's been a long time since I bought a new power tool...
A colleague bought a Bosch multi tool - internal crimped connectors failed in short order - the cheap own brand (Ozito, about £40) from Homebase bought to complete the job both completed his kitchen & bathroom and has since sorted the tiles in my en-suite.
Multi tools are also very good for cutting floorboards in situ to make access traps - something an electric grout remover won't do.
However. If the gap between your tiles is less than 3mm, a multitool disc probably won't fit...
If you had no network or your phone was off I wouldn't be surprised by an SMS delay.
Mobile coverage out here varies from intermittent if I'm lucky, to none at all, and it can sometimes be days before I go into town - texts taking several days to come through or being re-sent three or four times (presumably by the senders' service provider) are not unusual in in the wilds of Shropshire.
Having said that, you'd probably notice if your phone wasn't working or you'd spent three days away from civilization?
In principle a centrifugal fan should offer a higher pressure difference, with axial flow fans being more efficient for high volume low pressure duty. In practice, available space for fan and ducting takes priority - the 90 degree change in direction associated with centrifugal fans makes it difficult to go through a window or straight through a wall, but will be less of an issue when going through a roof space.
Corrugated ducting introduces significantly higher pipe (duct) loss compared with smooth walled - you might find an axial fan with smooth walled ducting will perform 'better' than a centrifugal system with an excessive length of corrugated flexi duct.
I suspect the main arguments for flexible ducting are cost speed and convenience when installing, which is why it is often used for the entire run rather than just a short length to accommodate an inconvenient alignment between rigid sections...
Circular saw with a suitable fence, assuming the doors can be removed - use wooden blocks or wedges to carry the weight before removing screws from the hinges.
It could also be done with a router or jig saw - much depends on what (or who) you have access to or can borrow. I'd offer to help but I suspect you're nowhere near the Shropshire hills?
A row of holes would work but you might want to avoid obvious modifications to rented property without the approval of the landlord. On the other hand, your landlord might be supportive and have the tools for the job or a tame handyman?
Have you asked on the DIY thread? https://www.lfgss.com/conversations/178667/
My (garden) shed often has a damp floor - brick paviors over a concrete base and no damp course - trimming a bit off the top and bottom of the doors improved things no end. Ground water still finds its way in, especially after rain, but the floor dries fairly quickly without obvious condensation elsewhere.
I think ventilation at both high and low level is the thing, given that water runs downwards (gravity) and humid air rises (less dense than dry air?)
Modifying the doors looks achievable - can you cut them evenly so no-one else will notice? Say 5-10mm off the top and bottom?
A bit of speculation: is your damp patch close to the lowest point of the fan ducting?
A couple of winters ago I had a sudden brown water issue (doesn't sound right however I phrase it) staining the ceiling and dripping from the fan switch: water in the duct had pooled and then found a way out.
My best guess at the time was the cold duct wall (unheated roof space) was allowing moisture to condense before it reached the outside - a shorter duct and lagging (a roll of garden fleece) seems to have solved the problem so far...
Thick cut, baking tray, oven for 10 - 12 minutes at 180C (fan). Turn after 7-8 min.
Mushrooms brushed with oil can go on the same tray.
Foil liner if averse to washing up.