Sorry, you'll have to redo the job. Here's the deal. ABS and PVC are not actually glued in the regular sense of gluing. The so-called "glue" is actually a solvent that melts the surfaces of the pipe and fitting for a few seconds. When you slide the joint together, the two surfaces blend together. The process is properly called "solvent welding". It is much the same as welding metal. One process uses heat to melt the two surfaces the other uses chemical reaction. The problem you have is that ABS and PVC are different materials and each requires its own solvent to melt the surfaces. Although your joints seem to be stuck together, the joint will not hold. I think there is a product that will work on both ABS and PVC, but I have no first hand knowledge of it. Sorry to rain on your parade, but at least you found out before covering the pipes and finding out when the joints failed.