This video, from ZH Fabrications on YouTube, breaks down the differences between all of the similarly-packaged but extremely different solvents and thinners that are commonly available and seen in every home shop, famously branded by Klean Strip and packaged in same-sized metal containers. In the fine tradition of home DIYers, you've probably used the wrong thinner or solvent before.
ZH Fabrications is based at ZHFabrications.com. There is also an accompanying downloadable reference chart available for free here.
Klean Strip does have their own guides (here and here), but this video and reference chart is a nice accompaniment.
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