For scale 3D model bed adhesion, top options include water-soluble PVA (white glue), hairspray, and specialized adhesives like Magigoo.
PVA is gentle on small details and easy to remove with water, great for delicate parts. Hairspray works well for PLA/ABS on glass beds, creating a temporary, easy-to-clean bond. Specialized glues like Magigoo prevent warping while keeping tiny components secure during printing.
For tiny scale models, use a thin PVA layer—apply sparingly to avoid hiding fine details, then wash it off with water once cooled.