About Rewax Guide
A Narrow Focus, Deliberately Chosen
Most resources on lava lamp restoration treat the wax as a secondary concern — something to be replaced when it fails rather than understood. Rewax Guide takes the opposite position. The wax is the mechanism. Its composition, density relative to the surrounding fluid, melting behaviour under thermal load, and susceptibility to specific failure modes determine everything about how a lamp performs. A guide that skips the chemistry and physics in favour of generic troubleshooting steps is, in a meaningful sense, skipping the subject itself.
This site exists because that depth is rarely assembled in one place. The information is not secret — it exists in materials science literature, in the practical knowledge of people who have worked on Mathmos units for decades, and in the observable behaviour of lamps under controlled conditions — but it has not often been written up with the precision that the topic rewards. Rewax Guide is an attempt to do that.
What the Site Covers
The site is organised around four related areas of content.
Compound composition covers what lava lamp wax is actually made of: the base hydrocarbon or microcrystalline wax fractions, density-adjusting additives, colorants, and the way those components interact at the molecular level. The page on wax compound composition treats this in full, including how small changes in additive concentration produce measurable shifts in bulk density.
Density calibration addresses the central physical relationship in any lava lamp: the wax and its surrounding fluid must have densities close enough to each other that the wax sits near neutral buoyancy at operating temperature, yet far enough apart at room temperature that the wax sinks solidly to rest. The density calibration page works through the arithmetic of this balance and explains how calibration can drift over time or go wrong during a rewax.
Thermal behaviour explains what happens as the lamp heats from cold — how the wax softens progressively rather than switching states abruptly, how thermal expansion shifts the density balance, and how convection currents in the fluid carry wax blobs through their characteristic rising-and-falling cycle. The thermal behaviour page includes worked examples of expansion coefficients and the temperature ranges at which different wax formulations become motile.
Mathmos-specific failure analysis forms the practical core of the site for readers working on a lamp that is not behaving correctly. Mathmos units, produced in the United Kingdom and manufactured to known specifications, are used as the primary reference throughout because their documented properties make precise analysis possible. The failure causes and failure cures pages treat each failure mode — clumping, clouding, surface filming, density drift — as a consequence of identifiable physical or chemical causes rather than as random misfortune.
Reference Material and Worked Examples
Alongside the explanatory content, the site maintains a set of reference tables covering wax densities, melting point ranges, and fluid properties, as well as annotated diagrams that map specific behaviours — blobbing, tailing, sticking — to their underlying causes. These are intended to be used alongside the explanatory pages rather than in place of them.
Who This Site Is For
Rewax Guide assumes readers are willing to engage with units and decimal precision, and that they would rather understand a mechanism correctly than receive a simplified rule of thumb. No prior background in chemistry or physics is required, but the site does not round off complexity that is genuinely important. Readers who want broader restoration guidance will find the FAQ a useful orientation, while those ready to go directly into the chemistry can begin with the main overview, which maps the full structure of the site’s content.