Based on this product's specifications, here are some alternatives and similar models
Putty for scale models VALLEJO 70.400 — grey modelling filler, 1 pc
Summary description:
VALLEJO 70.400 is a grey modelling putty designed for scale model assembly and repair. Supplied as a single pack (1 pc), it fills seams, gaps and surface imperfections before sanding and painting. Compatible with VALLEJO materials and suitable for plastic, resin and similar modelling substrates in hobby and professional model-making.