porcupines eating log cabin and outhouse

We have been looking for help, and came across your website.
We have a house in the woods in the Catskills of New York, and it is being eaten by porcupines.  They have been eating the Anderson doors, so we covered them with stained plywood, and they eat that.  They are eating out outhouse.  They are eating They have eaten parts of our cars, and much more.
How effective is the Ropel spray?
Is there any problem with spraying it onto a newly stained log cabin?
Two porcupines showed up on Saturday night – one was eating the outhouse, and the other was eating the plywood covering the doors.
We would appreciate any help you can give us.  This problem is making us sick.
We imagine that there are many, many porcupines.   There are ledges behind us and even an old unused quarry.
Is there any health problem, or problem caused by using the spray?  What is it made of?
Please let us know. Thank you in advance.

First, porcupines can and will do a lot of damage when wood is presented to them untreated and vulnerable.

Second, the Ropel is a good product to try initially but if you find it isn't doing the job, you'll need to go to the 4-the-Birds treatment explained in our Porcupine Control article. Based on the level of activity you say you have, I would guess there is a 50-50 chance. But where the Ropel fails, the 4-the-Birds will work.

Third, there is no problem using either product on a newly stained cabin.

Four, there could be more porcupines which is why many times the best solution is to trap them out and relocate them as explained in our Porcupine Control Article.

Fifth, there is no health problems caused by either spray; they are merely bad tasting repellents which animals do not like to eat.