Thinwater posted a DIY dust collector. I copied it a few years back for future projects. I bought my boat in 2017 and the PO had it soda blasted and barrier coated before I purchased it. It has one coat of black and one Shark White (ablative) when the black starts to show I touch up those areas only.
The solution? Create a homemade dust-collection system using a five-gallon bucket with hoses attached to its lid. With a few common tools, $48 in parts, and 10 minutes of shop time, you can cobble together a simple dust-collection bucket that will get you through the longest day of sanding without interruption and that allows easy transportation of the waste to a disposal site.
We’ve used this easy, do-it-yourself tool for bottom sanding, bilge cleaning, shower sumps, black water cleanups, cold fireplace ash, and even pumping muck from a home sump pit. When the five-gallon bucket fills, just move the retrofitted lid to a fresh bucket and continue. Work speeds along, and the full buckets are much easier to carry and safer to transport, pour, or empty into bags than a full shop vac.
What You Need
5-gallon bucket $2.98
Screw-top lid $7.25
(2) 1-in. thru-hulls 2 x $7.99 = $15.98
1-in. PVC 45 elbow 48 cents
(2) 24-foot 1-in. sump hoses 2 x $10.98 = 21.96
Total $48.68
How to build it
The DIY dust bucket is essentially a five-gallon bucket with two through-hulls (inlet and outlet) attached to the lid and sump-pump hoses fitted to the through-hulls. One hose is attached to your sander (inlet), and the other is attached to a shop vac (outlet).
1. To create the buckets outlet fitting, mark a circle thats the diameter of the through-hulls threads in the center of the lid. Cut a hole for the through-hull using a hole saw (best) or saber saw. Trim the through-hull flange to fit around the molded ridges on the lid (hole saw also works well for this). Repeat these steps for the buckets inlet (from sander), placing the through-hull as close to the lids rim as is practical.
2. To finish the inlet from the sander, caulk or glue (polyurethane caulk works well) the PVC 45-degree elbow inside the through-hulls rim fitting, on the underside of the lid, roughly parallel to the buckets wall; this will create swirl.
3. To complete the sanding kit, add one or two 24-foot sections of 1-inch sump pump hose, creating a super-light kit that will easily reach your boats entire bottom without having to move the vacuum as you work. (This hose generates an horrendous whistle when used as an open vacuum line, but when restricted for use with a sander it is quiet.)
Adjust the fitting sizes to suit your vacuum hose. We also recommend buying an extra screw-top bucket lid for transporting the waste to disposal, and buy as many spare buckets and lids as the work may require.
To test the effectiveness of the dustless sanding bucket, we used it with a cheap, thrift-store vacuum designed for small jobs the last time that we sanded the bottom of our 34-foot catamaran. The vac had a tiny paper filter, which clogged quickly when used alone. With it attached to the bucket trap, we finished the entire bottom-sanding job-many hours later-with no reduction in flow, and the mess was entirely contained in a single bucket.
The Bottom line
The total tally for the DIY dustless sanding bucket rang in just under $50 and took about 10 to 15 minutes to make. Testers have found that compared to using a shop vac alone, it made sanding easier (no vac to lug around) and it was effective, plus it makes cleanup and disposal a breeze.
A commercial version, the Oneida Air Systems Dust Deputy (
www.oneida-air.com), is available for about $100 for the full kit (including hose and bucket). In our opinion, its better suited for the serious home woodshop than the boat yard. While it does work well, the extra complexity and expense do not seem justified at the lower airflow rates required for sander-dust collection, in our opinion.
Again, this was originally posted by Thinwater!
I used the Bosch orbital sander that @jssailem mentioned for doing all the sanding. I had to sand off all the old paint down to the gel coat and then I did a complete epoxy barrier coat with it's (minimal but required) sanding.
