A box of chip brushes lasts me a few years and if you do a lot of boat projects and stuff around the house, it saves a ton of money to buy in bulk. I use them for epoxy, painting, varnishing and throw away after use.
https://www.amazon.com/Single-Brushes-Stains-Varnishes-Acrylics/dp/B078XJ2DCJ/ref=sr_1_1_sspa?crid=V18C3HO3BGC2&dchild=1&keywords=chip+brushes+2+inch+bulk&qid=1617725693&sprefix=chip+brush%2Caps%2C216&sr=8-1-spons&psc=1&smid=A1HD84JZ5JR3NU&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExQTlNNlhOUlNMS1kxJmVuY3J5cHRlZElkPUEwNjQ1NDc0MUVNR01XTEs3SlhLNSZlbmNyeXB0ZWRBZElkPUEwOTYzODM3RFgwWjJCNjNKVjAwJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ== Chuck S > On 04/05/2021 11:30 AM Shawn Wright via CnC-List <[email protected]> > wrote: > > > While I don't have a tar bottom, I enjoyed this thorough account as there > are some good general tips. What is a chip brush? > > Thanks > -- > Shawn Wright > [email protected] mailto:[email protected] > S/V Callisto, 1974 C&C 35 > https://www.facebook.com/SVCallisto > > On Mon, Apr 5, 2021 at 8:03 AM Matt Janssen via CnC-List < > [email protected] mailto:[email protected] > wrote: > > > > Dave, > > > > Is it possible you are trying to remove VC Tar or similar? > > > > Coal tar epoxy is the corrosion protection system we typically spec > > for steel sheets in a marine environment. Bluewater makes a bottom barrier > > coat for boats, but I suspect it's for commercial use on steel hull barges > > etc. > > > > If you're dealing with VC Tar as Joe and others have suggested, > > then misery loves company. I am the final stretch of the same project. > > > > For me the tar was softer, it smelled terrible and was still > > somewhat tacky in warm temps. After much trial and error I settled on two > > techniques that worked for me. > > 1. Chemical stripping - I used Citristrip and a glass cleaner > > https://www.homedepot.com/p/Anvil-4-in-Glass-and-Tile-Scraper-GTS-ANV/309996591 > > (4-inch wide razor blade) in lieu of a putty knife. With the razor blade > > (lots of replacement blades), and a little practice, i was able to peel off > > two or three layers of paint at a time and leave a smooth fair surface. On > > the tar, i was able to get between the tar and gel coat without gouging the > > hull. My boat was raced by the original owner and had a decent bottom, but > > had suffered from paint build up. While this sounds tedious, it minimized > > the fairing and longboarding. The rub is the stripper needs the temps to be > > close to 60-F (15-C) to work and needs to sit for at least an hour or two. > > If you're in direct sunlight or windy, you'll want to cover the stripper > > with plastic. You want to avoid letting it dry out. (Another boat in the > > yard didn't use plastic, but just mist the gel with a water bottle to keep > > it from drying out.) With the citristrip, i was able to apply it and leave > > it overnight covered with plastic and then come back to scrape it the next > > day. It seemed to work up to about 3-layers of paint. > > 2. Mechanical Removal - Unfortunately, I counted 12 separate > > colors of bottom paint before getting to the tar, i'm located in the NE and > > with a hard launch date, i had to use a mix of chemical and mechanical > > removal. The only system that worked for me without destroying the hull > > shape was a 6-inch random orbital sander using 80-grit Mirka Abranet pads. > > The Mirka are a mesh pad and do not clog with the tar as long as your dust > > collection system is decent. I used a home depot dust stopper > > https://www.homedepot.com/p/Dustopper-HD12-High-Efficiency-Dust-Separator-HD12A/315749552 > > separator before the shop vac. It is stupid expensive for what it is... > > but it really works and saves your shop vac filters. I could get 10 to 15 > > minutes out of the Mirka pads. I've gone through close to 30-pads in the > > project. > > > > I tried using traditional 36-grit pads but they were dulled after > > about 5-minutes. Also tried the Bahco carbide scrapers. Those worked well > > for level surfaces (e.g the rudder that you drop and put on saw horses) but > > it was tough sledding to work on your back under the hull. If you do go > > that route, bevel the edges of the blades and you won't gouge the hull. > > > > If you're still here, a few other lessons I learned the hard way. > > > > Managing heat on the pads was important. The Mirka pads do not > > insulate the hooks from heat. So you'll absolutely need to use pad > > protectors. If you don't, you'll melt the hooks on your sander and your > > disks will be flying off the sander by lunch on the first day. I lost a few > > days waiting for new parts when this happened to me... I also found lighter > > pressure on the sander worked better. Letting the pad spin faster allowed > > it to chew more of the material away. Easier on the shoulders too. > > > > Switching back to the stripper, I applied with a chip brush. > > Someone in the yard pointed out that i should only be brushing in one > > direction. Most have a wax in them that helps prevent drying out. Applying > > in one direction certainly helped increase the working time of the gel. > > Being dutch, i was able to wash the chip brush in hot water and used one > > brush for the whole job. > > > > Best of luck with the project -- cheers, > > > > matt > > > > C&C 27 Mk V > > EDUAM > > RYC, NJ > > > > > > > > On Mon, Apr 5, 2021 at 8:51 AM Della Barba, Joe via CnC-List < > > [email protected] mailto:[email protected] > wrote: > > > > > > > > > > I think this might mean coal tar epoxy barrier coat, which is > > > nice until it starts coming off ☹ > > > > > > > > > > > > Joe > > > > > > Coquina > > > > > > Thanks to all of the subscribers that contributed to the list > > > to help with the costs involved. If you want to show your support to the > > > list - use PayPal to send contribution -- > > > https://www.paypal.me/stumurray Thanks - Stu > > > > > > > > Thanks to all of the subscribers that contributed to > > > the list to help with the costs involved. If you want to show your > > > support to the list - use PayPal to send contribution -- > > > https://www.paypal.me/stumurray Thanks - Stu > > > > > Thanks to all of the subscribers that contributed to the list to > > help with the costs involved. If you want to show your support to the list > > - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks > > - Stu >
Thanks to all of the subscribers that contributed to the list to help with the costs involved. If you want to show your support to the list - use PayPal to send contribution -- https://www.paypal.me/stumurray Thanks - Stu
