(30 mins per door) 1 door can do double layers, 4 doors can do maximum 8 layers.
After doing this will improve in door sound proofing increase speaker bass and reduce road noise!
2 Material, same quality just different branding:
Singapore Technology : $40 per layer (U.P. $50)
STP Brand: $50/layer (U.P. $60)
This product was added to our catalog on Monday 19 February, 2018.