POR15, undercoat, or sprayon bedliner?

The floor on my 64 was in great shape so I painted POR 15 on with a brush it flows out nice and looks like you sprayed it on. I cleaned out and sprayed inside the cowl area where I couldent acess with a brush and I dont like spraying it you for shure have to wear a resperator its nasty to spray but its the only way that I could get it in there using a undercoat gun I covered the inlet area on the top of the cowl and sprayed in the removalable plug holes under the hood and in the air outlets inside the car making shure to move the gun around a lot to get all inside areas covered some was running out the drains on both sides so I think that its covered fairly well as I know this was an aera that rusted out on some cars. I have used POR 15 before and I like it I just hung up and painted my front and rear inner fender shields with it now Im ready to install them as soon as the vertical rubber seals come in.

I added a picture of a factory un painted cowl the POR-15 worked well for this area