Touch upâs should be done minimum 4-6 weeks post the initial treatment. This allows time for eyebrows to heal fully before perfecting them for the second time. Free touch-ups are only valid up to 3 months from initial procedure date.
Re: The Tinny sound? Most folks that are concerned about a tinny noise with aluminum boats are referring to the noise generated by the hull moving through the water (which can be modulated/reduced through many different avenues). You mention vibration and rpms, so I'm guessing that you're not referring to that sound.
All strange noises you hear in your speakers are caused by 1 of 2 problems: Ground Loops and EMI (ElectroMagnetic Interference). Commonly referred to as âengine noisesâ, these 2 problems are responsible for ALL âengine noiseâ problems. very common after an amplifier has been added to a stereo system.