yes check out Kamui they are amazing.
looking at your armor and the way you're building it, it might suit you better to use hot glue. it will glue and fill gaps in the seams. you wont be able to sand it but smoothing it with either your finger (if its not too hot) or a putty knife or butter knife of some sort would probably do the trick
another tip that might help with cleaning up the seams while gluing is to "clamp" the pieces together with masking tape while they dry. just tape all the seams up until its all set.