16 is good for reinforcing a joint and filling gaps. 4 is for joining pieces that fit tight. I have both at home but you'd have to come to camrose, st Alberta abit closer, and there's probably ppl better at working with acrylic in Edmonton. I made my sump and ato tank, but I'm still not the best at getting all the bubbles out of.joints. the sumps held up for over a year now tho!
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