I plan to use microballons to make wing fillets for my Dynaflite Chipmunk. I have read about the use of resin, bondo, epoxy, etc. with this product. Does anyone have any experience using Polyacrylic with microballons for creating structures like wing fillets? I've used the Polyacrylic for glassing wing joints and its worked well. Can anyone out there advise me before I take the plunge.