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If you can mask the rest of the model off, you can make a mix of PVA and water 50/50 or 70/30, something like that, with a drop or two of washing up liquid. Then use an eye dropper to get it on the lichen. This should strengthen it somewhat.
In future, if you want it strong, you can spray it with varnish before adding it to the model. Or, if you want to keep it soft, I think, you can soak it in glycerin (florists use it for this). But you might want to do a little research on that, don't take my word for it.
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