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#1
06-21-2017, 05:52 PM
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Weldon 40 is nice to work with because it's thick and not runny but it's not easy to make clean welds with it.
Something runnier like #4 is probably your better bet for super clean joins, but it's much harder to work with (at least I think so). I think you get your pieces placed together first and applied with pressure, then you take a needle bottle thing and follow it along and the weldon wicks into the join area.
__________________
-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee! 
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#2
06-21-2017, 07:13 PM
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Stick to glass. Hope that helps. Lol.
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#3
06-21-2017, 08:20 PM
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For cast acrylic use #4, for extruded use #3. Given the thickness I would assume its cast. 40 is almost totally useless IMO, only good for filling gaps which in reality you should never have. I doubt any tank manufacturer uses 40 or something of the like. Also I'd argue using #4 is significantly easier than 40 provided your edges are prepared properly.
You need to use a router or jointer (edge planer) to finish the edges and make them flat prior to gluing/welding and use a syringe with metal tip to apply the solvent. I remember seeing a good post somewhere with someone using a good technique for bubble free seems with thick acrylic. Basically used pins as spacers then flooded the joint with solvent and removed the pins. Personally I've always just balanced the acrylic panel in place and used the syringe with good success but I rarely worked with anything thicker than 3/8".
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