Thermoguard Thermoproof Interior Fluid

Thermoguard Thermoproof Fluid View larger
Typical Coverage (per coat)Supplied in pre-measured packs to apply 1 coat to 20m² or 80m²
Touch Dry2 Hours
ApplicationBrush, Roller, Spray
The figures stated above are approximate. Please ensure you refer to all datasheets for full application information.

Thermoguard Thermoproof Interior Fluid is a clear, colourless, penetrating Fire Protection with an optional functional Thermoguard Thermoproof Interior Sealer for wear, damp & UV resistance available in clear or woodstain colours.

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£89.00 + VAT

Thermoguard Thermoproof Interior Fluid is a clear, colourless, penetrating Fire Protection with an optional functional Thermoguard Thermoproof Interior Sealer for wear, damp & UV resistance available in clear or woodstain colours.

Intended Use

Fire protection fluid for porous internal wood.

Finish Options

  • Bare uncoated
  • Clear Sealed
  • Woodstain Sealed

How It Works

In a fire, Thermoproof Fluid reacts with the woods cells to create a flame & heat resistant barrier. Thermoguard Thermoproof Interior Sealer (optional) is a flame-retardant sealer.

Finish Options

  • Bare wood effect
  • Clear sealed - matt or satin
  • Woodstain* - matt or satin

*For available colours see Thermoguard Thermoproof Interior Sealer, also colour match service available.

UKAS Fire Test Standards

  • BS EN Class B s2 dO
  • Class O

Note: This product does not achieve 30 or 60min fire resistance.


  • Bare wood option - 1 coat Thermoguard Thermoproof Interior Fluid


  • Clear sealed finish:

1 coat Thermoproof + 1 coat Thermoguard Thermoproof Interior Sealer Clear**

Woodstain Finish:

1 coat Thermoproof + 1 or 2 coats Thermoguard Thermoproof Interior Sealer Woodstain**

*Resists light cleaning & handling.
**Allow Thermoproof to fully dry (min. 4 days) before applying any sealer.
***2nd coat for added UV protection, damp rooms or moderate cleaning.

NOTE: To check final effect, apply to test patch before application to entire area.


A Certificate of Supply can be issued on request for projects for insurance, Fire and Building Control Authority and Client Records.

Application Methods

Brush, Roller, Spray

Pack Sizes

  • Thermoproof Interior Fluid - 20m², 80m²
  • Clear + Woodstain Sealer - 20m², 80m²

Application Conditions

Apply to dry wood (Max. 16% moisture), above 5°C in dry conditions.

Limitations - Stained, Varnished or Painted Wood

  • For treatment with Thermoproof to be effective, it needs to be able to penetrate the wood.
  • Thermoproof can be applied over water-based penetrating wood dyes that do not seal or make the wood water-proof.
  • To fire protect painted wood, see Thermoguard Timbercoat.
  • To fire protect clear normal varnished wood, use Thermoguard Fire Varnish Basecoat & Thermoguard Fire Varnish Overcoat.
  • To fire protect external stained varnished, woodstained or other coated wood, contact Technical Dept.

New Fire Regulations & Tests Explained

  • The new fire standard BS EN test lasts 20 minutes with airflow replaces the old BS 476 tests which lasted 10 minutes and strangely restricted airflow.
  • The new standard for flamespread and heat release Class B replaces Class O.

The new BS EN tests also monitor -

  • Smoke & Gas “s” – s1 + s2 are none or very low & compliant levels, s3 = moderate , s4 = heavy smoke.
  • Flaming Droplets or Airborne particulates – dO is none, d1 = low, d2 = moderate, d3 = high levels.

Environment & User Friendly

Thermoproof Interior Fluid, Thermoproof Interior Clear & Woodstain Sealers are water-based and environment friendly.

Quality Assurance

Products Manufactured under ISO 9000.

Send us your question


Can you use on untreated timber and then cover with a stain products

Tom from London (Uk) - 09/02/17


Yes if you use Thermoproof Original which is a different product to Thermoproof Fluid. It is important to wait until all water in Thermoproof Original has all escap after application before overcoating. The cost is the same as Thermoproof Fluid but we do not offer this on the website so orders must be placed over the phone.

An alternative option to achieve a similar result would be;
Thermoguard Fire Varnish Basecoat +  EITHER
Internal -   1 coat of Thermoguard Fire Varnish Overcoat (Interior) - clear or mixed to woodstain shade.
External - 2 coats of Thermoguard Fire Varnish Overcoat (Exterior) - clear or mixed to woodstain shade.

Question about the product

I have read and agree to the Conditions of Use (read) Send

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Free delivery on orders over £75 (terms & conditions)

• Deliveries will be made within 3 working days (standard delivery)
• You must be UK mainland based for the free delivery offer.
• Postcodes listed are excluded from the free delivery and priced below.

Please note: deliveries will need to be signed for at the point of delivery.

UK Mainland OnlyUp to £75.00£75.01 +
Standard (2/3 working days)£8.00FREE
Next Day£15.00£15.00
Next day before 09:00am£30.00£30.00
Next day before 10:30am£25.00£25.00
Next day before 12:00pm£20.00£20.00
Saturday Delivery£35.00£35.00

£25 (Standard 2-3 Day Delivery Only)

AB30, AB31, AB32, AB33, AB34, AB35, AB36, AB37, AB38, AB44, AB45, AB46, AB47, AB48, AB49, AB50, AB51, AB52, AB53, AB54, AB55, AB56, FK, G83, IV, KW1, KW2, KW3, KW4, KW5, KW6, KW7, KW8, KW9, KW10, KW11, KW12, KW13, KW14, PA, PH, HS, KA27, KA28, ZE

£35 (Standard 2-3 Day Delivery Only)


£50 (Standard 2-3 Day Delivery Only)


Please note that all carriage prices are quoted without V.A.T. at the current rate.

Scottish Islands - outside standard distribution area, please contact us for a quote.

There may be an exception for heavy goods when purchased in quantity where we will contact you to advise any additional charges.

Next Day delivery and Saturday Service is available on stocked items for orders received before 11:00am only.

Because of the nature of our products, we use specially selected carriers to ensure safe and prompt delivery to you.

Please note: Any time or date named by Rawlins Paints Limited for delivery is given and intended as an estimate only and Rawlins Paints Limited shall not be liable to make good any damage or loss whether arising directly or indirectly out of a delay in delivery. Deliveries are made using a reliable nationwide carrier. Although over 99% of consignments arrive on time, we recommend that no labour is employed to undertake work until materials have arrived on site.

Thermoproof Interior Fluid TDS


Thermoproof Interior Fluid MSDS

Whilst every effort is made to ensure our data sheets are up to date, we advise you check the latest revision directly with the manufacturer to ensure you have the most current version.
E J Rawlins & Co. Ltd trading as Rawlins Paints make available product data sheets and information in good faith but without warranty. We do not accept liability for any errors or omissions contained within the data sheets or any outdated versions.