they use a special acrylic cementfor acrylic(I guess if you think about it it actually melt/welds)thanks so much everyone for the replies! it makes me feel a lot more comfortable going with 1/4", tho it sounds like even with baffles as support you do need bracing as well..? that's no problem, adding braces doesn't seem like to big a deal... i will check to see what type of sealant/cement is used in the sump that i am looking at and let you all know so you can tell me if it's any goodthanks again!
As mentioned 1/4" is fine with proper bracing.