goop is definitely not silicone glue. whatever it is based on is solvent
based. it can be thinned with toluol which lately is the replacement at
homedepot for toluene.
it sticks well to a large variety of surfaces. there are multiple types sold
by the same company and it has never been clear to me what the difference in
composition is.
i've been using it thinned to a syrup consistence to "prime" plastic
surfaces that otherwise don't take glue well before attaching black velvet
to it for telescope baffles.
for some reason they don't post the msds on their website but it is
available on request by email from the contact tab at
http://www.amazinggoop.com/73
jim ab3cv