The DINITROL 6030 Pyrmoplast Aluminium - Metalised Body Filler came out as best budget buy in an independant survey into non pourous fillers, for its ease of application, overall finish and the effortlessness with which it could be rubbed down. 6/6 for value for money! Metal fillers create a stronger and more flexible repair than a standard body filler. Extra Hardener is also available. Method of Use: The surface must be free from oil, dust, grease, loose lacquer, paint residues and rust. Filing the substrate with sandpaper will increase adhesion. Mix the required amount of putty with 2 − 3% hardening paste and apply immediately. Working time (pot life) approx. 5 minutes. Depending on the temperature and amount of hardener, the putty can be filed in 15 − 25 mins.