I second EarlyMan's post. I've printed with the 4000 on Entrada in all its finishes and weights, and I use PremierArt spray always. Never any problems unless I spray too soon or too heavy.
I use three very light coats applied from at least 12-18" away, with each coat's "strokes" applied at 90 degrees print rotation from the one before.
Most likely answer is that your ink was still wet when you applied the spray (can take dense blacks at least a few minutes or more to dry; ideally the prints should dry 48 hr before you spray them) or you sprayed too heavy a coat.