actually no. for rain, spashes etc its fine but if your planning on going swimming in it, dont. the resin soaks up water particles and they then form into lil bubbles under the skin thus misshaping and weakining the structure. thats why boat that are made from fiber glass are coated in loads of layers of paint. jus letting you know incase your were acuialy planning on going swimming in it.
p.s. a quick dip shouldnt damage it and it would be prity hillarious to see mc jumping into a pool.