If the standard Mr. White Putty is your go-to for spreading and filling, the P-123 Low Viscosity version is what you reach for when precision matters more than volume. Thinner consistency straight out of the tube means you can work it into tighter spots, hairline seams, and fine surface defects that a thicker putty would just sit on top of rather than fill properly.

Still a solvent-based lacquer putty, so it cures hard, sands cleanly, and scribes without tearing. The lower viscosity also makes it easier to apply with a fine brush or old sprue tip, giving you more control over exactly where it goes and how much you use. Less cleanup, less sanding, better results.

White base keeps coverage readable, and it plays well under Mr. Surfacer and the full Mr. Hobby lacquer primer range. For deeper structural gaps look at epoxy options, but for refined surface prep on Gunpla and detail-heavy mecha kits, the P-123 gives you a level of application control the standard version simply cannot match.

Lacquer-based product. Use with an organic vapor respirator and proper ventilation.