1522 is a soft plain open weave surfboard 4 oz that is also loved by model builders. The A218 surfboard finish is one that we sell a lot of to model builders that is soft enough to do the job. 1522 finished in Volan would be somewhat softer but very little is woven or that makes it to us anyway. Being the open weave it is the A218 finish works pretty good in being soft enough to conform to pretty intricate areas. All rolls are rolled on 2" pvc and carefully packed as usual.
Style 1521 is the warp version of 1522. Style 1521 fiberglass cloth has a thread count of 30 x 18 instead of the 24 x 22 used in style 1522.
We used some of the 1521 to try a layup in some RC boat molds.