steelhead9 Posted February 24, 2016 Share Posted February 24, 2016 Does anyone know of a reason not to use Krylon clear adhesive 1301 in place of paraloid B-72 for fossil preservation The active ingredient in the krylon is paraloid B-66 which is slightly harder than B-72. Thanks! Still Life Fossils Link to comment Share on other sites More sharing options...
Auspex Posted February 24, 2016 Share Posted February 24, 2016 Do you want to use it as an adhesive, as a consolidant, or as a coating? "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
steelhead9 Posted February 25, 2016 Author Share Posted February 25, 2016 Do you want to use it as an adhesive, as a consolidant, or as a coating? Mainly as a coating, possibly very minor consolidation. Thanks Still Life Fossils Link to comment Share on other sites More sharing options...
oilshale Posted February 25, 2016 Share Posted February 25, 2016 (edited) Paraloid B66 seems to be a Methyl methacrylate / Butyl methacrylate (~50:50) copolymer whereas the B72 is an Ethyl methacrylate / Methylacrylate copolymer. Both polymers should be very stable against yellowing plus the coating is reversible (soluble in toluene). The slightly higher glass-transition temperature (40 vs 50°C) is definitely no problem - should be even better. Only thing I don't like is the application as spray paint. It is very convinient, but spray paints are formulated with highly volatile organic solvents - people want them to be dry with minutes. I prefer to dissolve the polymer in organic solvents with lower volatility (f.e. toluene) and use brush application to get a better penetration. Thomas Edited February 25, 2016 by oilshale 3 Be not ashamed of mistakes and thus make them crimes (Confucius, 551 BC - 479 BC). Link to comment Share on other sites More sharing options...
steelhead9 Posted February 25, 2016 Author Share Posted February 25, 2016 Paraloid B66 seems to be a Methyl methacrylate / Butyl methacrylate (~50:50) copolymer whereas the B72 is an Ethyl methacrylate / Methylacrylate copolymer. Both polymers should be very stable against yellowing plus the coating is reversible (soluble in toluene). The slightly higher glass-transition temperature (40 vs 50°C) is definitely no problem - should be even better. Only thing I don't like is the application as spray paint. It is very convinient, but spray paints are formulated with highly volatile organic solvents - people want them to be dry with minutes. I prefer to dissolve the polymer in organic solvents with lower volatility (f.e. toluene) and use brush application to get a better penetration. Thomas Thanks Thomas. Very Helpful. Still Life Fossils Link to comment Share on other sites More sharing options...
FossilDudeCO Posted March 6, 2016 Share Posted March 6, 2016 Great question Steel, I came across some Paraloid B-99, which is softer than the 72 and had a very similar question! and thank you for the helpful response Oilshale! Link to comment Share on other sites More sharing options...
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