Dont know how the weapon R stuff works but I dont think its as simple as water and dry and yes the filter must be 100% before you put it back on.
I only go AEM and I always use the recharge kit for the AEM filters. You may want to find out or Im sure someone that knows on here will tell you if the W/R filter needs oiled or not cause Im not sure. Frankly I hated oiling my AEM filter it took forever and took too much time. First time I did it I over oiled the hell out of it and spent like 3 hours letting the filter bleed out the access oil.
