Started repainting in a darker yellow (Citadel Golden Yellow = RAF Trainer Yellow), the first bottle was thick so I added a few drops of water which made it too thin – a 2nd bottle was ok.
Finally figured out the right way to assemble the 14 parts for each Crab grab-arm – the hole & pin of every part had to be cleaned, thinned or drilled. It’s clear the manufacturer never expected this kit to be built – fit is 120% too tight, the material is that soft “grabby & furry” plastic like many toys.