I am building a bath vanity out of walnut. I dyed it with Transtint in Alcohol and I've filled the pores with Transtint colored Behlens Pore-o-pac (oil based). I want a very water resistant poly finish. I will be spraying outside and this week it will be 55-60 degrees out from about 11am until 4pm. I was planning to use varathane oil based poly to be safe going over the Pore-o-pac but I've really liked the general finishes water based products. If I wait 48 hours to spray the water based poly over pore-o-pac am I safe for sure? What about tempurature, water based or oil based better given the lower than ideal temps?