Patch won't hurt if you're already taking the tyre off and it's not covered in gunk. Sealant will probably work anyway though.
I don't have to take the tyre off, but it's no biggy to do so. No sealant added yet - I'm going to wait until I've finished building the frame and fork before adding sealant to the tyres - so entirely gunk-free.
@Brommers started
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Patch won't hurt if you're already taking the tyre off and it's not covered in gunk. Sealant will probably work anyway though.