My personal favorites are MEK for anything styrene, and acetone for acrylics. I've built some interesting doo-dads out of plexiglass using acetone (applied with a brush) to bond it. It also works at least moderately well for styrene, so that's what I use when I need to bond the two together.
I've had decent results with commercial products sold in hobby shops, but it's hard to justify the cost. Since styrene and acetate are about 99% or what I work with, MEK and acetone do the trick nicely.
BTW, my method for testing a solvent is to touch a drop to some scrap or the backside of a part, then stick my finger in it. If I can leave a fingerprint, the solvent will work. If not, that's what super glue and epoxy are for!
I've had decent results with commercial products sold in hobby shops, but it's hard to justify the cost. Since styrene and acetate are about 99% or what I work with, MEK and acetone do the trick nicely.
BTW, my method for testing a solvent is to touch a drop to some scrap or the backside of a part, then stick my finger in it. If I can leave a fingerprint, the solvent will work. If not, that's what super glue and epoxy are for!