Rotten Wood Repair Kits are ideal for the restoration of Windows, Doors and Boats. Anything made of wood with a rotted area is an ideal candidate for restoration with a repair kit.
These are premium repair kits, comprised of a pair of very high performance two part products. They may appear expensive, but the real cost of any repair is never the materials, and is always the time required to do the job properly (normally proper surface preparation). These kits can make a permanent waterproof repair.
How will this repair my wood?
The CPES will consolidate rotten timber, penetrating deeply into the damaged rotted wood to consolidate and toughen it whilst stopping the rot completely. The Fill-It filler will bond strongly to the CPES saturated timber, offering a permanent flexible repair which is bonded to the underlying wood. Your rotten wood repair will be permanent – the rot will not return. The CPES seeks out all of the rotting wood, that which is clearly rotted, and the wood that has just started to rot underneath it. All of this will be saturated with CPES, and the rotted timber will rot no more.
The performance of these products at repairing rotten wood is evaluated at WoodRestoration.Com.
Why is this better than other Rotten Wood Repair Products
This kit contains the worlds finest penetrating epoxy. It penetrates deeply and will find all rotten wood. You do not have to carve out all rot. You will not be left with wood that has started to rot underneath your repair, as CPES will seek that out too.
The filler is also a two part epoxy. It flexes with the wood, and mixed properly is so waterproof that it may be used below the waterline to repair boat hulls. It is an aggressive adhesive and will bond permanently to the CPES treated timber ensuring a permanent repair. It may be coloured to match the wood if required.
You will be left with a permanent repair to your rotted wood. The filler will be bonded permanently to stable epoxy saturated wood. The repair will last.
Most other products use an acrylic (a type of plastic: perspex is a common brand name of an acrylic plastic) base dissolved in a solvent as their wood hardener. It is a relatively cheap solution, which does not require mixing as it is a one part product. It’s performance does not compare to that of Clear Penetrating Epoxy Sealer, and the acrylic does not bond anywhere near as firmly to wood fibres as the wood derived resin in Smiths CPES.
Many of the competitors wood fillers use a polyester filler. Polyester fillers are easily identifiable by the relatively small amount of hardener used. They are similar in basis to the body fillers used for car repairs. Polyester fillers do not stick as well to wood as epoxy resins.
We will be conducting some real world testing of common wood repair products performance against CPES and Fill-It in the near future. Check back to see the results.
Will It Save Money?
The final finish, whether paint or varnish, will bond thoroughly to the CPES reducing maintenance costs and increasing durability. It is often far cheaper to repair rotting wood than replace the rotted wood with new, and these products will affect a permanent repair that will last.
All repair kits are supplied with CPES and Fill-It at a discount of 7.5% to purchasing them separately.
Rotten Wood Repair Instructions:
- Remove any paint from the rotten wood repair area. It is recommended to remove paint from the entire piece if you can as the CPES will make any good wood very resistant to rot in the future, and will further make your paint or varnish finish last much longer
- Remove any rotted wood that is so rotten that it can be removed with your fingers. Retain anything firmer than this as CPES will harden rotted wood to the point where it will carry screws and filler without failure
- Allow the wood to dry out thoroughly before continuing with your rotting wood repair. Dry timber is much easier for the CPES to penetrate into
- Before applying CPES ensure that you can keep the work area dry until it has chemically cured
- Apply several coats of CPES (You will normally use Cold Weather formula for treating rotted wood, as it evaporates faster, but you may use Warm if you already have some, or need warm formula for another purpose as well) to the wood with rot, allow as much to be absorbed as the wood will take. One mixing can be used to apply three or four coats within one day if the solvent smell has dissipated. Keep mixed CPES covered between coats. Allow 24 hours to dry and partially set after the final coat. There should be no solvent smell and the surface should be firm to the touch. Large sections of rotted timber can take much longer for the solvents to evaporate, as they will absorb much more CPES into the rot. Moving air with fans can speed this process.
- Deep areas of rot can have holes drilled into them to assist getting CPES deep into the section of rotted timber. Our CPES injection syringe can be used to good effect on rotten timber joints in window frames and similar, allowing for application of CPES to a precise area that will consume a lot as the porous rotted end grain is restored.
- Once the rotting or rotten wood is saturated, the last coat will dry with a sheen, indicating that the wood will absorb no more
- Now mix and use the fill-it filler to restore the profile on any rotten areas removed in step 2. Colouring Kits are available if required and may be used to colour the filler to the colour of the damaged wood to allow varnish or clear finishes to be applied. Full details on Fill-It, including thorough mixing instructions can be found on the Fill-It Flexible Epoxy Filler.
- Allow the filler to set before any final finishing. Finish the Filler by carving or sanding.
- Apply a final sealing coat of CPES over the filler and wood. This will promote the adhesion of your paint or varnish top coat, reducing maintenance and extending life
- Your rotten wood repair should now be complete, and will just require finishing. The timber should now be very hard and highly resistant to further rot or water damage. The CPES dries as flexible as wood, and is also micro-porous, so the surface is very hard to damage yet will still allow the timber to breathe
- Apply the first top coat 24 hours after the final coat of CPES typically, The CPES should be dry to the touch, and not smell of solvents, but still be chemically curing. It will bond to the top coat, gluing it to the wood in a very permanent manner. As the restored wood will still breathe, micro-porous paints may be used to good effect
These are only very brief instructions, full instructions are included with each kit, and if you have specific problems, such as nail rot, we can advise you on how best to deal with those. Please contact us for assistance if this is the case.
What sizes of CPES and Fill-It do I need?
Fill-It Epoxy Filler
Fill-It Epoxy Filler does not shrink, so a void of 1 cubic centimetre is filled by 1ml of product. 1cu inch is 15 cubic centimetres, ml or cc’s.I include imperial measurements as I find it far easier to calculate volumes of cracks etc in inches. Examine your hole after you have removed any loose rotten timber as described.
You should always use two separate tools to remove part A and Part B from their containers, unless the entire volume of the container is to be used at once!
For estimation purposes our packages contain the following amounts:
|Package||MilliLitres (cc)||Cubic Inches|
|12 US Fl Oz||355||22|
|2 US Pint||950||58|
|1 US gallon||3785||231|
Clear Penetrating Epoxy Sealer (CPES)
CPES use is very hard to accurately estimate. New softwood or ply will consume around 1 litre per 5 sq metres. Hardwood coverage may be up to 10 sq metres / litre.
If you are reading this you are very unlikely to be considering new wood coverage however. Treatment of rotten wood is normally done using cold weather formula as it evaporates faster.
Seriously decomposed rotted timber, soft to the point where you can push your finger through it, will consume up to 3 times the volume of the timber to harden it as far as it will go (to a rock hard piece of epoxy around some cellulose fibres). Less badly rotted wood will of course consume less. It’s nearly impossible to estimate accurately how much any piece of well rotted timber may consume without trying the CPES on the actual rotten wood, but if you estimate the same volume of CPES as obviously softened rotten timber that is as good a starting point as any.
The most accurate means of estimating the CPES requirements of your rotten wood is to trial it on an area. The aim is to saturate the rotted timber. We will take back unused product in saleable condition if you wish to buy enough to ensure you can get the job finished.
What About The Rest Of My Old Window Frame?
While repairing a rotten section of any exterior wood item, if the entire exposed surface is cleaned back to bare wood (and dried if it is damp) it can be sealed with CPES whilst the repaired area is being restored. This treatment will seal the exterior surface of the wood permanently against the elements, particularly protecting end grain and vulnerable areas of the item. This finish will be breathable, allowing for micro-porous paints to be used to good effect. Furthermore the CPES will bond the final finish to the last coat of CPES very strongly, reducing future maintenance requirements if the final finish is applied whilst the CPES is chemically curing but after the solvents have evaporated.
Further Information for Our Rotten Timber Repair Kits
If you are unsure of which temperature CPES you require, click here.
For details of the use of CPES as a primer click here, wood hardener (consolidator) and rot restorer, see here.
To see how wood rots, and why the unique resins in Smiths CPES allows permanent rotten timber repairs, click here,
The rot doctor has just concluded some 5 year exposure testing of Smiths CPES, click here to view Rot Doctors 5 Year exposure test.