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You might try Krylon Crystal Clear Acrylic Coating 1303. It claims to be UV invisable, and it does darken the print up, but, I'm not sure it is worth the extra step. I've had better luck with just doing 2 prints on heavy tracing paper 90#, carefully aligning them both on a light table, and using the the "double" for the mask. This works well...the vellum or heavy tracing paper is nearly UV invisable.
---In homebrew_pcbs@yahoogroups.com, <bitsyboffin@...> wrote:I have read that Toner Darkener is basically a matt clear acrylic, or even hair spray, from this thread...
http://forums.mrprint.com/archive/index.php/t-339.html?s=359ca146435e3d18bd6e16c71e1c7e0f
" you can spray the laser output with Krylon Matte Finish Acrylic and if you find that still too costly, you can purchase AquaNet Hair Spray that has been relabeled as a "commercial" toner darkener."
I tried some clear acrylic rattle can from bunnings a few weeks ago, it did make it darker, but I don't know if it's worth the trouble (I didn't actually try exposing it yet).
On 08/11/13 13:01, Kerry Koppert wrote:
O have some good results, but the large
dark areas tend to be less than opaque having a speckled appearance
which tends to be reproduced on the copper.