A wooden piece is screwed against a plastered block-wall. Both, the wooden piece and the plaster, are primed and painted.
Problem. I expect that there will be a thin crack between the wood and the plaster in a few months.
Question. How to finish the wooden and plastered surfaces, such that the cracks between them are less likely to form?
What I thought so far. Leave a 3mm gap between the wooden piece and the plastered wall, then fill the gap with silicone. Let the silicone have the same paint as the plastered wall. But a problem with this approach is that the light reflection might not be the same. E.g. the silicone area might be more shiny.