Silicon sealant that has turned black with mould

Ronzo · Veteran Member

Silicon sealant that has turned black with mould

Bicyclecamper · Guru

Selley's Rapid Mould Killer, Bunnings about $8, spray on, leave on for 5 minutes, then wipe off with a wet clean cloth then dry, best mould cleaner and killer out there. Use gloves and mask, as it is pretty strong. Also good for mould on van exterior walls, awnings, chairs, anything.

Ronzo · Veteran Member

Thanks

Ronzo · Veteran Member

The black mould is embedded in the silicon sealant, its not on the surface. Will this product penetrate into the sealant?

Radar · Guru

Ronzo wrote:
I have a south facing side of my van where the white silicon sealant around by boot has turned black with mould. Other than cut and scrape it out and replace it, is there easier or simpler solutions Looking fw to hearing from you guys out there Regards Ron

I use vinegar mixed about cup full in few litres of water.

I believe the mould is ontop of the silicone.

hufnpuf · Senior Member

If the mould has gone inside the sealant, it wouldn't be effectively sealing any more, would it?

If it's just on top, you could also try "30-seconds outdoor cleaner". My previous van had black spots on the exterior and it took them straight off.

Mamil · Senior Member

I used this stuff in my bathroom, applies over existing sealant, got it from the big green shed.

bomurra · Veteran Member

Hi Ron,

Strangely mould will grow quite happily inside silicone sealant. Unless you purchase a silicone like Bathroom and Kitchen or Wet Area Sealer that contains a mould growth inhibitor.

You may find this very difficult to eradicate. Don't forget that many of the liquids others have suggested may react with components of your van. Physical removal and replacement although time consuming maybe the best alternative.

The best sealant to use where silicone has already been used, is another silicone, as many other sealants will not adhere correctly to the substrate if silicone is still present, even a very thin film..

regards,

Bob.

Dick0 · Guru

Bicyclecamper wrote:
Selley's Rapid Mould Killer, Bunnings about $8, spray on, leave on for 5 minutes, then wipe off with a wet clean cloth then dry, best mould cleaner and killer out there. Use gloves and mask, as it is pretty strong. Also good for mould on van exterior walls, awnings, chairs, anything.

Works a treat!

Possum3 · Guru

Agree with Ric - Selleys Mould Spray works a treat.

Ronzo · Veteran Member

Thanks again everyone Ive decided after considering all options to just cut the old moulded silicone out , cleaned it thoroughly let it fully dry then re siliconed it with opaque Selleys silicone that has a mould inhibitor in it and it came up like new All the best Ron