Enameling: problems and solutions (II)
In this post we bring you the second part of the decalogue of problems that can occur during enameling and their solutions.
6. Brittle Enamel
It’s because the mixture contains an excess hardener, when. Mixing with a scale and following the proportions required in our technical data sheets for each hardener ensures a resistant enamel, which does not break.
7. Colored “waters” appears when mixing colors with whites
A dissociation of the pigments has taken place and there is a problem of tension above all with the white color. To homogenize the mixture of colors, add ADDITIVE O.L to the mixture in a proportion of 1% to 5%.
8. Colorless layer does not run or retracts when applied over another.
When applying clear enamel on a enameled base it may not spread properly or even shrink. This is because the base coat carried ADDITIVE O.L.
The solution is to add Additive O.L to the colorless enamel mixture at a ratio of 1/1000.
9. Enameling flat parts without edges
Enamel exceeds the limits of the part/label
There is probably an excess of enamel that the piece cannot contain. The solution lies in applying less enamel and ensuring that the ambient temperature does not exceed 25º (which would make the product more fluid).
To avoid these problems, we recommend mixing directly with our Doming Flex B, specially created for pieces without edges and labels.
Colorless enamel does not spread correctly. It retracts
When colorless enamel is applied on a enameled base, it may not spread properly or even retract. This is because the base coat carried ADDITIVE O.L.
The solution is to add ADITIVO O.L to the colorless enamel mixture at a ratio of 1/1000.
10. Enameling curved and semi-curved parts
The enamel picks up, drop shaped
An excess of enamel has been applied. The solution is to apply enamel in small quantities, maximum 0.2mm or 200 microns.
Bubbles and micro-bubbles appear in colorless enamels
The mixture has been shaken very vigorously, generating too much air. In this case, if, after Enameling, bubbles are visible on the surface of the piece, it will be enough to apply thermal shock with a soft flame (blowtorch) or use the vacuum pump to remove bubbles from the mixture.
Waviness or uneven surface
Produced by marks from the enamel needle, the use of a brush or other means of application, these imperfections disappear by applying light heat with a blowtorch.
The enamel picks up and forms a drop inside the oven.
Enamel becomes more fluid with temperature. Leaving little time to rest (until gel point) or the oven is too hot, may be the reasons. It is important that the enamel of the piece reaches the gel point before putting it in the oven and ensure that the temperature of this is between 30-40 º.
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