Was it something like this?
https://www.bunnings.com.au/davco-20...ender_p0034888
Obviously that time of year, Bunnings have sold a lot of this since Friday afternoon - many stores are now saying no stock.
I decided in the end to cut my existing surfaces, it may be a decision I come to regret but worried more that if I feathered it, the edge might shrink back or pick up and look worse than a cut line.