- Product Dimensions: 13 x 13 x 13 inches ; 13 pounds
- Shipping Weight: 9.3 pounds
- Domestic Shipping: Item can be shipped within U.S.
- International Shipping: This item is not eligible for international shipping. Learn More
- ASIN: B0000AXNNI
- Item model number: MK20128
- Average Customer Review: 4.5 out of 5 stars See all reviews (41 customer reviews)
Amazon Best Sellers Rank:
#396,794 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
- #437 in Sports & Outdoors > Sports & Fitness > Boating & Sailing > Boating > Maintenance Supplies > Cleaners
- #1718 in Sports & Outdoors > Sports & Fitness > Boating & Sailing > Boating > Hardware
- #19972 in Sports & Outdoors > Sports & Fitness > Hunting & Fishing > Fishing > Fishing Watercraft & Trolling Motors
MaryKate On and Off - Hull and Bottom 1 Gallon Cleaner
We don't know when or if this item will be back in stock.
- Enter your model number to make sure this fits.
- Works instantly to remove the toughest waterline stains, algae stains, rust & gas exhaust stains
- Use on fiberglass only
- Will not harm gel coat
- This item is not for sale in Catalina Island
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The best selling, most used hull and bottom cleaner on the market today, Marykate On & Off instantly removes waterline stains, algae stains, rust, and exhaust stains. The advanced, industrial strength formula softens barnacle rings and zebra mussels for easy removal. Safe for use on fiberglass, just brush it on and rinse it off! 1 gallon.
Top Customer Reviews
Maybe most people purchase from local marine store (like I did first time).
Anywhooo.... To the point: 1)-- when I was a teenager, end of each boating season, we cleaned hull of family runabout with series of rubbing compound, polishing compound, then fresh wax job (yeah, I know, "novices" or your choice of -facetious adjective.... you won't hurt my feelings).... and Pop, if you're reading this, I forgive you, and I don't think this experience is a component of my current close relationship with the chiropractor.
2) later (and I won't admit how many years it took for us to "call-BS" on that approach), tried other products, then over time moved on to muriatic acid (WHICH THIS PRODUCT IS NOT--- but rather much more effective/efficient in my humble opinion).
3 Summary editorial:
A This stuff is the berries-- one of those "are you kidding me?-type products."
B) combo of hydrochloric, oxalic and phosphoric acids
C) surprisingly used only 9/10th's of a 1 gallon bottle (yesterday) to clean entire hull of 25 foot Glastron GX255--**** that had been docked in fresh-water lake/reservoir for 5 months****
D) "FOLLOWING INSTRUCTIONS":
i). definitely gloves, eye-protection, mask (first 2 years I used a bandana, this time a 3M particulate mask--b/c I had a box in
garage--- but, probably no better than bandana, since won't filter gaseous fumes--you can get a mask that will work, I just
opt to "try" to be careful..... avoiding the "enclosed spaces" is the key--this doesn't just mean doing it outside--rather if your
crouching/kneeling/laying partially under boat on one side, particularly if there is no circulation/breeze or if you are
"downwind," you're gonna get a whiff of some choke-worthy fumes (sometimes the more concentrated fumes are briefly
ii) method of application-- see "E" below
E). Application: first year did it exactly as per instructions-- applied with paint brush, rinsed (I used an 1850psi cheapo-electric
powersprayer). Worked beautifully, BUT, 7-8 hours in long pants, LS shirt, bandana on face and head, vinyl gloves filled with sweaty hands, goggles fogging-up nonstop-- and I still found a way to get a couple small blisters under watch band and back of neck. I also know I inhaled the most fumes that year. If you do it this way, I found that a mechanic's dolly is a godsend (the thing
you lay on and roll around under stuff).
--Second year--bought a telescoping-handled bristle brush. Better for your lungs and nasal passages, safer for your
eyes and skin, but lots of wasted product, and somewhat challenging to apply without "honey, you missed a spot" (actually, I'm single, but most of you suckers are probably married, so figured I'd talk your lingo, no matter what your gender-- and if anyone researching this has 2 X-chromosomes..... WAY TO GO).
--Third year--took it to detailing shop and had it done (think it was $200-300).
--THIS YEAR: I'm sure many have thought of this before (I'm sometimes kinda slow)..... But my epiphany idea actually worked.... $6 garden/weed sprayer...... could adjust nozzle from mist to stream.... don't advise mist.... set it somewhere in the middle for the easy to reach places (kind of a "shower" spray for more uniform and complete application)...... adjust it more toward "stream" to get the harder-to-reach places. Now, could have been the cooler temp yesterday (45-50F), but we found that letting sit for 4-5
minutes helpful-- previous years, when warmer, this stuff literally "melts" the algae / waterline stains off as you stare in amazement, mouth agape, over 30-60 seconds, then spray it off.
Caveats / Final thoughts:
1). Definitely needed good power sprayer yesterday (again, not sure, but suspect cooler temp?).
2). First 2 years did it in driveway, discolored focal areas where prolonged exposure--kinda looked "cleaner" concrete--but was NOT permanent. Apparently, it's technically eating-away at the pavement?
3). Put the pets inside
4). Yesterday, after spraying on acid, initially used that bristle brush to "spread around" because some of the product was obviously dripping off of the hull (and I didn't know how far the 1gallon was gonna go)---- I think this approach actually wasted more product, cuz had to hit these areas twice. Once stopped using the brush, letting sit for few extra minutes, were golden.
5). Product will "foam-up" a bit when it contacts the algae stains-- was helpful on dual-prop Merc outdrive, cuz lots of nooks and
crannies, AND because once fairly clean, realized when rinsed and air-dried, would still have some residual patchy area of smegma stains. Sooooo, rather than waiting for complete drying after rinse, I just lightly sprayed again and areas that needed more would foam up. Will also foam up on any rust (we have a trolling plate mount with some screws that aren't the best)-- so seems to
clean the little bit of rust off of these.
6). I use it on outdrive--takes a couple extra "spot cleanup" passes-- they sell an "outdrive-specific" product, I don't know if different or just marketing.
7). I use it on props-- takes several quick applications.
8 I havent covered trailer with plastic sheeting since first year..... I havent noticed any damage.... But, I'm sure it would with 5-10 minute exposure-- I did notice one silver dollar sized patch on diamond-plated side-step of trailer, where I'd ignorantly left a little puddle of acid probably 10 minutes--made it shiny probably took coating off.
9). I DID NOT LIKE THE "GEL" Formulation of this product-- tried initially year #2-- just absolutely did NOT work for me.... even
with repeated applications of various "incubation times."
10). WHAT IF I GET THIS ON SKIN, IN EYES, ETC.
-- obviously follow instructions, be smart and careful.
-- but, only speaking in terms of my personal experience...... have gotten it on my skin numerous times (one nice thing is it's
not insidious-- you'll know quickly, it starts to sting, and I've never had to do anything except quick 10-second water rinse)
Got a face full of the mist a couple times yesterday (swirling wind)..... Coughed, closed eyes tightly, recoiled in
Mild-moderate temporary discomfort...... splashed some water on my face and in my eyes..... nutted-up and moved on
just make sure to remove your acid-splashed vinyl gloves first--- no, I actually thought to do this, surprisingly). And while
i have donned eye protection 90% of the time while using product, I didn't have my goggles on when this happened, yep.
11). If I remember anything else to bore you with, I'll add it later
12). I'm not manic, and immodium AD does not help "verbal diarrhea"--but you see why I have to be selective with what I review
13) I certainly have no affiliation to MaryKate OR Ashleigh, although the former should reimburse me at minimum wage for the
2+ hours it took me to "2-finger type" this on this frigging iPad.
The boat looks terrific! I would highly recommend this product!
Get Small bucket, get a cheap paint brush, brush it on, stand back, observe magic.
Does not remove oxidation. Just mold and lime scale.everytime.
For many other questions, refer to: [...]
Most Recent Customer Reviews
I only wish I had bought the product in gel, instead of liquid.Read more