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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.
freddo-
Stanley blades (or their equivalent) are so cheap that if you have a stout knife/blade holder they work best, I find. Won't be much use for anything else once you're done, but see my previous "cheap" sentiment.
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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.
stevo_com
Airhead
How big are said cracks? If hairline - 1 or 2mm I would just carve out a V groove with a stanley knife, brush/hoover out the dust, fill, sand, refill, resand, prime and paint. My living room was covered in hairline/crazing cracks due to the age of the plaster and changing atmospheric conditions (worst around the radiator). I did the above all over and you'd hardly know about it.
For bigger/deeper cracks, you'd want to first fill with bonding then some finishing filler over the top.