Nice work and thanks. Yeah most are hairline, a couple are 1-2mm. I was thinking about a grout removing tool or something for the larger cracks.
https://www.amazon.co.uk/Purdy-14A900210-Multi-Tool-Nylon/dp/B073T4WG27/ref=asc_df_B073T4WG27/?tag=googshopuk-21&linkCode=df0&hvadid=309859586326&hvpos=&hvnetw=g&hvrand=7486549601661325135&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1006886&hvtargid=pla-588843030605&psc=1&th=1&psc=1
There are foldable versions and some with more features but basically one of these is what I have used for a long time.
If you've only got a bit to do maybe just hammer a nail through a bit of wood. Ideally you want to rake the crack out to a v shape.
@Airhead started
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Nice work and thanks. Yeah most are hairline, a couple are 1-2mm. I was thinking about a grout removing tool or something for the larger cracks.