As you may perhaps expect, glues and sealants contain even more nasties than paint – but then we expect them to do some tough jobs without failure, and often, as yet, they cannot perform these functions without the odd highly toxic, environmentally impactful ingredient.
Much like paint, the issues largely concern VOCs and the production of various ingredients. Formaldehyde, solvents, and phenols are chief amongst the villains, although there are as many chemicals in glues as there are glues themselves. As with paint, it is best to specifically research the glues available for the task at hand and compare chemicals to databases of toxins.
For good all-round eco sealants got to: http://www.ecobondadhesives.com/products/