I have a 2011 Keystone Avalanche that I'm living in full time. My black tank is made of ABS and a mobile service technician recently found a small pin size hole at the bottom of the tank. It appears that over the years, this spot was a low pressure point when the tank was full. I'm the 2nd owner ; just recently purchased it in January 2020.
After doing some research, I found a product called "Plasti-Mend Black " that is specifically made for ABS black tanks. Here is the URL for this product.......
http://plasti-mend.com/cart/index.ph...&product_id=96 .
In addition to Plasti-Mend , i've seen another product that is primarily used for boats called " G/Flex 655 Epoxy " .
If anyone has used either of these products for a repair of an RV Black tank , i would love to hear from you with your comments.
As a friendly reminder ; I'm not looking for " replace your black tank " , type comments . I'm looking for someone who has experience repairing their black tank or have used these products.
Thank you