Clumping is foam crumb that clumps together unlike ground cover that easily separates. This allows the modeller to "break"off chunks of clumping or build up areas of clumping with its excellent textured appearance to easily reproduce undergrowth and forestry scenes.
Once satisfied with the appearance a light coating of diluted white glue finally holds the desired shape even longer.
Large 1000ml bags will be suitable for most layouts and even more effect can be achieved by using both the medium and fine together. Endless uses.
Whilst every effort is made to retain colour accurracy some variation may occur. Internet colours should not be assumed to be accurate.