Homebrew PCBs

At 06:27 PM 17-09-16, you wrote:
>
>
>Anyone tried this stuff? Spray it on, run a Laser over it, it turns 
>black and waterproof/permanent. A wet sponge wipes off the unLasered portion.
>
><https://www.cermarksales.com/>https://www.cermarksales.com/
>
>I don't know what the lowest power Laser is that can be practically 
>used with this. Their website is a bit light on details.
>
>I found a distributor with a lot more information. It only mentions 
>CO2 and Fiber Lasers.
>
><http://www.engraversnetwork.com/products/thermarkcermark/laser-settings-chart/>http://www.engraversnetwork.com/products/thermarkcermark/laser-settings-chart/
>
>I have no idea if one of those blue and green 5,500mW solid state 
>Lasers on eBay, Amazon, and Bangood would work, for instance added 
>on to an existing 3D printer or CNC engraver/carver. CO2 lasers are 
>far IR at around 10,000nm.

Are those solutions color sensitive or only thermal sensitive?
Why not 1W laser with reduced speed 10 times (from the recommended 
15cm/sec)  for the LMM14 spray?
Cristian