Patio magic and green algae on canvas canopies

[Dellquay13]

I’ve seen mention of patio magic ( and other brands of similar) suggested for cleaning green algae off canvas canopies and spray hoods. Before I start spraying it on, I would like to confirm other people have done this and not ruined their canvas? It seems counter intuitive to spray anything that cleans such tough algae onto the material that needs so much care to keep it weather proof

 

[TSB240]

PM has a biocide as its main active ingredient. There is some soap but no strong acids or alkalis or solvents that might damage your canvas.
I usually spray it on neat on a windless dry sunny day. Wait till all has gone brown, wash off with a hose pipe and retreat with PM as it will act as a preventative measure.
Only apply canvas waterproofing treatments after this stage.

 

[Tranona]

It is indeed "magic" stuff and works well if applied as described.

 

[MikeBz]

I use it on teak cockpit decks and canvas with no adverse effects - but only whilst ashore as it;'s very toxic to marine life. I do dilute it fairly well (but can't remember dilution...). I put it on the decks when we come ashore for the winter and it stops them going green for virtually the whole winter.

 

[LittleSister]

Should one wash/scrub the general dirt/grime off first, or start with the Patio Magic (other brands available) and leave the dirt until one's washing the deceased algae off?

(I'm planning on doing some of this soon.)

 

[DipperToo]

Keep it off the plastic windows on the sprayhood and any canopy windows. It can cause clouding AFAIK.

 

[RunAgroundHard]

Salt, common household salt, low cost works very well. Damp the green area, sprinkle salt onto the green area, then scrub in with a nail brush, then wash off with fresh water.

 

[Poignard]

Salt, common household salt, low cost works very well. Damp the green area, sprinkle salt onto the green area, then scrub in with a nail brush, then wash off with fresh water.

Never heard of that before but it's worth a try.

Thanks.

 

[MoodySabre]

I would get the worst of it off first with water and a brush. Dilute PM as shown on the container and apply with a brush so it doesn’t go everywhere, particularly not in the sea. Don’t use it when rain is due. Leave it to work over a few days.

 

[RunAgroundHard]

Never heard of that before but it's worth a try.

Thanks.

I got the tip from Duncan Wells book “101Tips for Stress Free Sailing”. There are another 100 tips! It’s a great wee book, all tried and based on real world experience.

 

[Dellquay13]

I slapped it on the pram hood of my 2 year laid up motor boat in quite a strong concentration, the algae and the lichen is already going brown, and the side decks haven’t been so clean in years. It’s in the boatyard so little worry about the runoff killing fish

Do I need to do anything else, wash it off in a few days? Jet wash or just wait for the unusually elusive Welsh rain?

 

[Gumpy]

Used it on my covers for years, spray on walk away then a few days later its clean.
However
Never use it when covers are on the boat it contains chemical that are harmful to marine life.
I always do my covers on the drive at home for this reason.

 

[dunedin]

We have used Pagio Magic on sprayhood etc with no issues. But always worth trying on a small patch first.
We always paint on rather than spray.

 

[ashtead]

We use it on Flexiteak decks with no adverse results
Painting on canvas actually sounds a good idea to manage run off to plastic windows mention above.
I don’t really think you need to wash off but you might want to reproof.

 

[Concerto]

A good tip to help keep the plastic windows clear is to use Pledge Furniture Polish. This is what classic car owners use on soft top windows which use the same plastic.

 

[Gsailor]

We used to use it as everyone else mostly suggests with great affect.

Aldi used to sell it cheaply.

 

[john_morris_uk]

I dilute as per the instructions. Leave for the rain to wash the algae off. Excellent results at almost no effort.

 

[iantomlinson]

I’ve seen mention of patio magic ( and other brands of similar) suggested for cleaning green algae off canvas canopies and spray hoods. Before I start spraying it on, I would like to confirm other people have done this and not ruined their canvas? It seems counter intuitive to spray anything that cleans such tough algae onto the material that needs so much care to keep it weather proof

That stuff has harmful chemicals to rivers. Try looking at wet&forget. No chemicals. Used it for 10yrs on fibreglass, canvass,sails,wood,stainless,ropes etc etc. Spray in on and leave. Brilliant stuff.

 

[PaulRainbow]

That stuff has harmful chemicals to rivers. Try looking at wet&forget. No chemicals. Used it for 10yrs on fibreglass, canvass,sails,wood,stainless,ropes etc etc. Spray in on and leave. Brilliant stuff.

You think ?

From the data sheet: https://www.wetandforget.com/downloads/SDS_USA_WetForget_OutdoorReadytoUse_05182022.pdf

Aquatic toxicity: LC50 Bluegill sunfish: 2.35 ppm 96 hours
LC50 Rainbow trout: 7.8 ppm 96 hours
Avian toxicity: LC50 Bobwhite quail: 2700 ppm 8 days
LC50 Mallard duck: >4500 ppm 8 days

 

[Gixer]

That stuff has harmful chemicals to rivers. Try looking at wet&forget. No chemicals. Used it for 10yrs on fibreglass, canvass,sails,wood,stainless,ropes etc etc. Spray in on and leave. Brilliant stuff.

Just be careful where you use it as it’s very toxic to aquatic life.