Frequently Asked Questions

Cause: Experience shows that fractured joints are always in direct connection to side-bonding. In turn this also depends on indoor climate, wood moisture, type of wood, adhesive, state of the base and the lacquer system.

Solution: Ensure steady indoor climate (55-65% relative humidity). Wood moisture of the parquet should be 8-12%. Use special parquet primer to prevent block and side-bonding.

Correction: Sand complete fl oor down to raw wood, as far as possible; check substructure and bonding; refi ll joints and reseal using suitable primer.

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Cause: Wrong method due to uneven application. Wrong tools. Temperature too high (>+25°C).

Solution: Apply evenly wet-on-wet. Careful application without too much / too little overlapping! Do not work into areas too dry! Use suitable roller or brush. Work with several people on large surfaces and coordinate the work directions beforehand! Avoid temperatures >+25°C (lacquer early mornings or evenings). Turn off under fl oor heating in time. Possible use of retarder.

Correction: Sand and then reseal the layers where the protrusions are visible.

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Cause: Bad drying conditions. As well as temperatures from min. 15 – max. 25°C there must also be suffi cient air exchange. Water vapour in saturated air must be regularly exchanged with „fresh air“ so that the given drying times can be achieved and the desired properties of the coating material can be formed. Also, with 2C lacquers the mixing ration not adhered to. Too low temperatures and / or too high humidity and / or too thick application of lacquer.

Solution: Take care of mixing ratio with 2C lacquers. Room / material temperature not below 18°C (ideal+18-25°C). Humidity within 40- 70% (ideal 55-65%). Wood moisture between 8-12%; Make sure there is enough air exchange (draught free!)

Correction: Adjust room temperature and provide air exchange (no draught) In extreme cases complete sanding and re-construct.

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Cause: Sanding error in wood especially in the transition area between edges and surface can lead to discoloration. Switching between different sanding medium within the surface.

Solution: Wood sanding must be carried out very carefully. Gradual sanding up to 120 grain with lacquer. Even out transition areas between surface and edge with a single disc sanding machine.

Correction: Sand the whole floor down to the wood, fill joints and reseal.

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Cause: Previous lacquer layer detaches again and lifts upwards. Possibly application quantity too high of existing sealing layer resulting in insuffi cient drying. (Drying parameters not observed?) wrong material combination of primer and sealing.

Solution: Adhere to drying times between lacquer layers! Calculate longer drying times in the case of low temperatures and / or high humidity. Use suitable material combinations.

Correction: Sand the whole fl oor well and reseal.

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Stain has gone off due to being attacked by bacteria and/or fungi.

Treatment is either not possible or pointless as most vital ingredients have decomposed and the colour tone has been upset. Prevention by adding BZ 900 preservative. 1% is enough for mere storage protection, and 2-3% with a dipping basin. Additional treatment is required here at specific intervals.

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Can Hesse UNA-COLOR DB 555 colour tone be painted?

UNA-COLOR DB 555 colour tone can be painted or, as may apply, rolled on by adding a painting additive.

Treatment: 85% UNA-COLOR DB 555-colour tone additive of 15 % paint additive EL 460-0048 + DR 470 hardener (mixing ratio 10:1); Treatment information --see technical information Info Hesse UNA-COLOR information: Please use a brush suitable for solvent-based lacquers. We recommend a short-haired lambskin roller for rolling.

Please check the result of the coating with a test coat.

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With positive stains the positive effect is controlled by amending the formulation and here by reducing by BZ 882.

With finished positive stains, adding 5-20 % water can lead to a clear reduction of a positive effect that is too striking.

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In most cases an amount of stain that is too rich has been applied. Here it is ideally applied by spraying without wiping. Alternatively, the whole wood can be moistened, with end grained wood especially strongly. Do not allow to dry and stain the wood when damp instead. If necessary, the stain must be applied in concentrated amount.

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Cause: Wrong method due to uneven application. Wrong tools. Temperature too high (>+25°C).

Solution: Apply evenly wet-on-wet. Careful application without too much / too little overlapping! Do not work into areas too dry! Use suitable roller or brush. Work with several people on large surfaces and coordinate the work directions beforehand! Avoid temperatures >+25°C (lacquer early mornings or evenings). Turn off under fl oor heating in time. Possible use of retarder.

Correction: Sand and then reseal the layers where the protrusions are visible.

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