What car is this for? Don't recall the quarter panel to end cap panel seam being sealed or sprayed with sound deadener
Many years and plants didn't use spray seam sealer.
Pattern would be too narrow (it appears from the pictures) for some years and plants quarter panel sound deadener applications and wheel wells unless your going for a more generic and keep from any signs on where the passes are since that will make the narrow pattern stand out IMHO
Deduct for this all the time and unfortunately it stands out if you know your cars
Might want to try a lower pressure You you don't get all the fine stuff around the edge and even refrigerate the product before you spray it