The Toupret fillers are a cut above the likes of Tetrion or Polyfiller powder based fillers (in the main) but any filler that is slightly harder or softer than the existing emulsion will leave a dent or ridge.
I haven't used the particular filler recommended by Jacko though.
Part of the secret is using the right grade of abrasive. The mesh papers (eg Abranet) are often better than standard papers
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