1) 2 potential issues here. Has the ball bearing got stuck in the pump and thus won't allow the Resin to pass. This will need a quick disassemble and reassemble after a quick clean. Other issue could be that the Resin has crystallised due to the recent cold weather you have just had. Does warming the resin help solve this problem?
2) Microfibre/Silica will make suitable fillets if you are not concerned about colour.
Thanks
Phil
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