G4 Clear Pond Seal

(5) Based on 1 Review

Description

G4 Pond Seal is a moisture-cured polyurethane, which forms a non-porous seal on concrete, brick or porous stone.

G4 uses the moisture in the air and substrate to cure. It is important that the substrate is sufficiently dry to be porous so as to enable the first coat of G4 to bond and obtain a mechanical grip. G4 can be applied in poor weather conditions, high humidity and at temperatures down to 0°C. G4 seals out lime. G4 only provides the waterproof seal. On no account use a P.V.A. based sealer to seal or prime any surfaces. These materials can contain ammonia.

G4 is an excellent sealer for brickwork but below the waterline the brick should also be rendered. The reason is that while the G4 is able to seal hairline cracks it is not capable of bridging larger joints, cracks or holes.

Method Of Application - G4 Standard 3 coats = 550 gms/sqm (for the 3 coats)

1. Ensure the concrete render is dry, (see earlier section) certainly dry enough to be porous.
2. If an old pond, repair any cracks or replace damaged areas, and allow repairs to dry.
3. Ensure surface is clean, any algae is removed, brush off dust and remove loose material.
4. Consumption figures are given in a separate section.

Repairing Cracks In Concrete

A normal cement render mix can be made or there are rapid hardening cements that can be used. When using cements to repair remember that it must be allowed to dry out properly before application of the G4 coating. Alternatively G4 can be used to make an extremely tough repair. Chase out any cracks to provide a reasonable area to fill. Prime with G4 and wait until finger tacky. Mix 6 parts dry fine sharp sand with 1 part G4 (by volume) into a mortar, as dry as possible, consistent with trowelling and using a putty knife or spatula, grout the mix into the crack, leave level. Do not apply in layers thicker than 10mm at a time, if necessary build up layer by layer, leaving a minimum of 8 hours between each application. Very narrow, hairline cracks can be sealed with G4 prior to general application.

G4 Cure (Hardening) 

G4 is mechanically hard after 24 hours and workable on some 6 hours after final application. However, 72 hours must elapse for full chemical cure, before washing down the G4 with copious amounts of clean water. This water should be drained off. The pool can then be filled. Consumption will vary slightly according to the porosity of the substrate. The coverage is based on practical experience gained from many users.

Waterfalls

G4 is used to seal waterfalls and from the practical experience of customers it performs satisfactorily.
It is advised that the base of the waterfall is rendered. When dry, apply 3 coats of G4 Pond Seal and allow to harden. The ornamental stone can then be embedded in and grouted. If using a liner on the base, before rendering, then additional time must be allowed for the render to dry, since the render can only dry from the surface.

Before using the user shall determine the suitability of the product for the intended use. This information is offered in good faith but without guarantee or liability. G4 cannot be used to seal over bitumen, P.V.C. or Butyl Rubber linings. It will not bond to the P.V.C. or Butyl Rubber although it will not attack them.

Select Your Options

  • 500g clear

    £16.99

  • 1kg clear

    £24.99

  • 2.5kg clear

    £49.99

  • 5kg clear

    £74.99

  • 25kg clear

    £259.99

Delivery Information

FREE Mainland UK* Delivery on orders over £40.00.
or £4.95 Delivery on Orders Under £40.00.
 £6.95 Next Working Day Delivery.

 *Additional delivery charges may apply to the following destinations: Isle of Wight, Isles of Scilly, Northern Ireland, Republic of Ireland and Scottish Highlands. Please contact us for a customised delivery quote.

Customer Reviews

Overall Rating 5 / 5 Based On 1 Reviews

Delivery 5 / 5
Quality 5 / 5
Price 5 / 5

Repair of concrete waterfall

We purchased this product as we have a home made concrete waterfall going into our pond, which leaked and emptied the pond during use. We had tried other products which had not worked, but G4 pond seal worked a treat, sealing the unseen cracks in the waterfall - now the waterfall works without emptying the pond!

By Sylvia Jones.
12th, August, 2016.

Questions and Answers (17)

Nelson Asked:

I am trying to repair my old concrete pond which has been leaking .Somebody has suggested that I should use G4 to seal it. A sealant was originally applied to the concrete, do I need to remove it before applying the new G4?

We Replied:

Dear Nelson Thank you for your question. As G4 should only be used on a porous surface, all the old sealant will need to be scraped off. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Andy Hobson

Thursday 03rd, April, 2014
Malcolm Brock Asked:

Is this Pond Seal harmful to fish and other pond life once it has cured?

We Replied:

Dear Malcolm Thank you for your question. Once it has cured it is completely safe to all pond life and fish. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Andy Hobson

Thursday 17th, April, 2014
Robert Asked:

How long does the Clear Pond Seal take to fully harden? I've applied it to a waterfall, but don't know how long to leave it before turning back on!

We Replied:

Dear Robert Thank you for your question. We'd recommend 24 hours. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Andy Hobson

Sunday 11th, May, 2014
Graeme Drewery Asked:

I am having a raised concrete 12ft x 7ft pond built. Could you please advise which sealants etc I require to make it waterproof and fish safe? I would also like to have the area painted with a light colour if possible.

We Replied:

Dear Graeme Thank you for your question. We recommend the Gold Label Pond Paint which is available in several different colours, please follow this link: /Aquatics/Gold_Label_Pond_Paint.htm Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Luke Sinclair

Thursday 28th, August, 2014
Doug Maw Asked:

I have quite a bad leak from a concrete pond which has previously been coated with G4. The surface is quite mucky and the old G4 is peeling in places, but I can't see any obvious cracks in the cement. I intend to pressure jet it clean, peel off the old G4 where I can and recoat the whole pond with new G4. Should the new G4 bond OK on the old stuff?

We Replied:

Dear Doug Thank you for your question. It is advised that G4 is only used on a porous surface, so if you can remove as much of the old sealant the better this will work a lot better. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Dan Everton

Monday 09th, March, 2015
Sue king Asked:

We have just built a waterfall and would like to seal it with G4. As we have fish in the pond our question is: do we have to remove the fish before we paint the waterfall or can we leave them in the pond?

We Replied:

Dear Sue Thank you for your question. You cannot allow any uncured G4 pond sealer to enter the pond water as it is toxic to aquatic life. As the waterfall will require several washes before it is safe for use this will be very difficult to achieve. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind Regards Aquatics Team

Tuesday 09th, June, 2015
Graham Asked:

I'd like to use a sealer to cover some rock work that has been painted with acrylic paint. Can I apply G4 to this to seal the paint and rock work together?

We Replied:

Dear Graham Thank you for your question. As this is not an enquiry we have had before we would advise calling the manufacturer on 020 8778 0071. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Dan Everton

Wednesday 10th, June, 2015
Carole Elmer Asked:

I know someone who used G4 on concrete, starting at 9am on a very hot day. They came back 3 hours later and applied a 2nd coat. 3 hours later it was fully hardened. The following day at 10am we had rain for 4 hours. Would this have affected the waterproofing for the waterfall?

We Replied:

Dear Carole Thank you for your question. After the final coat, if rain is suspected, we advise you to cover the area as any uncured G4 can be compromised by rain. From the information you provided the area should have been cured. For verification we would recommend calling G4 on their helpline number 0208 778 0071. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Dan Everton

Monday 06th, July, 2015
Stephen murphy Asked:

Can this sealant be painted onto pond liner?

We Replied:

Dear Stephen Thank you for your question. This product is for use with concrete only, it will not adhere to liner. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Dan Everton

Tuesday 15th, September, 2015
Vicky Asked:

I wouldn't be using this sealant for a pond but rather to waterproof the inside of a newly built rectangular planter which has been made out of breeze blocks. I intend to apply this pond sealant after rendering the breeze blocks. Is G4 is toxic to plants?

We Replied:

Dear Vicky Thank you for your question. Once G4 is dry and cured it will be safe for use with plants. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Dan Everton

Wednesday 20th, April, 2016
Polly Asked:

I have a an oak whisky barrel that I would like to use as a small pond/water feature. I was considering G4 as the product to seal the wood as it is porous. Previous posts have mentioned G4 can only be used on concrete but also say on porous material. Can I use G4 to seal the oak barrel. If not, can you recommend an alternative to seal the wood that would not be harmful to fish/pond plants.

We Replied:

Dear Polly Thank you for your question. Unfortunately we do not have any sealer for wooden ponds, people usually favour using rubber or pvc liners to ensure a watertight unit. Please follow this link to suitable products: /Aquatics/Pond_Liners/ Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Dan Everton

Thursday 12th, May, 2016
Adam Asked:

I think my fibreglass waterfall is leaking, can G4 be used to seal fibreglass?

We Replied:

Dear Adam Thank you for your question. Unfortunately, G4 is only suitable for use on Concrete. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Debi Roe

Saturday 28th, May, 2016
Robin Gilby Asked:

I have a brick and block walled pond rendered with a cement and sand screed which has included a pva waterproofer/adhesive in the mix. Will G4 be acceptable to use on this substrate?

We Replied:

Dear Robin Thank you for your question. Yes, G4 will work for this application. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Dan Everton

Monday 04th, July, 2016
Ben Asked:

I've been sealing the fountain above my pond with the water flow turned off. However, a small amount of G4 sealant was washed into the water. I've netted out as much as I can and there isn't any fish in my pond just yet. Do I need to completely empty the pond or will any particles cure and just sink to the bottom?

We Replied:

Dear Ben Thank you for your question. We would suggest a complete water change as this product is toxic to aquatic life. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Dan Everton

Friday 29th, July, 2016
Shaile Asked:

What is the best method of getting rid of G4 sealant from a concrete pond that is losing water?

We Replied:

Dear Shaile Thank you for your question. We would recommend contacting the manufacturer on 020 8118 0071. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Dan Everton

Monday 08th, August, 2016
keith Asked:

Small spots of G4 have been spilled on porcelain paving, it's proving very difficult to remove, can you advise?

We Replied:

Dear Keith Thank you for your question. I can only advise that you contact the manufacturer on 0208 778 0071 Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Paul Ilsley

Friday 02nd, September, 2016
Mike Burne Asked:

I'm restoring a cement-like reconstituted stone 19th Century bird bath. The surface is porous and also has deep cracks. What is the finish of dried G4 on something like cement - is it matte, eggshell or gloss? I'm considering filling the cracks with Milliput, will G4 adhere to this adequately?

We Replied:

Dear Mike Thank you for your question. G4 is very hard to adhere to epoxy unless it is really sanded down with 40-80 grit paper and the whole unit is perfectly dry. Even then you would need to use three coats of the G4. We would recommend filling the cracks with small amounts of concrete so you can ensure the G4's adhesion. Should you wish to contact us further or to place an order, please call us on 0121 355 7701. Thank you for using our online Q&A system. Kind regards Dan Everton

Wednesday 10th, May, 2017

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