Marc could back this up a little better because he does a lot of acrylic work and his welds are clean (im jealous, please teach me). You need your acrylic edges to be smooth. if you get them smooth then weld-on 4 will give you a good clean bond. Weld-on 16 is what I use when there is a small gap or less than perfect form. Because it is thicker it also leaves stringers when you pull it away from gluing your piece. If those stringers fall on the acrylic where it shouldn't be then you are going to distort the piece. You need to identify your application before you decide on what solvent to use.
