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.
Cast Aluminum Tool & Jig Plate. Also known by tradenames MIC-6 Cast, K-100 Cast, and ALCA PLUS Cast, Cast Aluminum Tool & Jig Plate is produced from a fine-grain aluminum alloy which is free from internal stresses. This material is internally stable, which assures minimum movement during machining.