Warning: I glued a cracked pot rim before the lab saw it and almost wrecked the whole find
Everyone on my crew swears by a quick touch of superglue in the field, but I did that on a Romano British rim sherd outside Cirencester last month and it set before I could line up the break. I ended up soaking it in acetone for 40 minutes to undo my mess, and the conservator gave me a look I will not forget. What do you all use to hold a sherd steady without making it permanent?