SCOTCH base from DARK is a medium hardness medium acid base (pH 4) for substrates for solid materials, camouflage bases and low alkaline bases. The base is for substrate only and is NOT for alignment. Before applying it is enough to degrease and, if necessary, apply a primer. Has a medium density comfortable consistency The polymerization time at 24 W is 1 minute, 48 W is 30 seconds.