I started this trial on 12 December 2021. Six months on, I looked at the tiles after cleaning off all the sticky residue from the black masking tape. There was slight yellowing of the exposed area on the white and purple tiles but this is not easy to see in the photo. The neutral tiles showed no noticable change to the colours but the varnish has attracted a lot of dust/dirt, so I would definitely not use varnish on items intended for outdooors.
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| Trial after 6 months |
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