Siniat MastaBase

Product Code



MastaBase is a hard setting plaster based cement for bedding tape into recessed edges and butt joints. It is also suitable for second coating plasterboard joints, internal and external angles and fastener heads.

mastabase has a consistent working time of 45 minutes with a 60 minute setting time. All Siniat jointing and finishing compounds can be used over mastabase as a final coat.

MastaBase Wets out quickly and mixes easily by hand or electric mixer for a smooth, creamy consistency, it is easy to trowel for both hand and mechanical tools, and has good body on the trowel and on the hawk. The shorter working time is ideal for smaller jobs and the quick drying means less waiting before sanding, with time available for fine edges when feathering. MastaBase has good resistance to cracking in internal angles.


  • High joint strength
  • Easy to scrape back
  • Quick drying
Compounds Description Product Weight (kg)
MastaBase Bedding Cement* 10.00
MastaBase Bedding Cement 20.00
Siniat Product Catalogue Download
Siniat blueprint Lightweight Construction Manual – NEW! Download
Siniat Plasterboard Installation Guide Download
VOC Content Test Certificate – mastabase Download
Siniat Dry Power Jointing Compounds – Non Hazardous (SDS) Download