McDonnell's Perma Ceram specializes in custom bathtub and tile refinishing. The tub guys at McDonnell's Perma Ceram have been refinishing tubs in the Bucks, Montgomery, Chester and Philadelphia Counties for 30 years. Call today for a free estimate!. MCDONNELL'S TUB TEKS specializes in bathtub and tile refinishing. We are family owned and operated and have been serving bucks. Philadelphia. Montgomery and chester counties for 30 years.