Definitely get profiling tools. But I wouldn't get a really cheap gun. They bend and break.
I'm happy with this screwfix on which is still inexpensive, but much more robust than my first. https://www.screwfix.com/p/no-nonsense-heavy-duty-sealant-applicator-gun/136fr
Your choice is almost definitely a Cox pro-sealant gun.
@mespilus started
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Definitely get profiling tools. But I wouldn't get a really cheap gun. They bend and break.
I'm happy with this screwfix on which is still inexpensive, but much more robust than my first.
https://www.screwfix.com/p/no-nonsense-heavy-duty-sealant-applicator-gun/136fr