I once bought a car that had had a leak stopper put into the power steering system. When restoring the car, I took the steering box and pump apart to do renew the seals and do the job properly. The hoses had to be replaced, they were about to burst as they had become so soft.
If I thought a vehicle had had anything like that put into it I would not touch it. As Kelly says, it is just a cover up for a very short period only.
Keep it away from any reasonable vehicle, do the job properly, it will cost far less in the long run.
Jake.