Boss UltraPoxy 1ltr pack
Code: 16510
- Permanently flexible – Withstands expansion, contraction, and seasonal movement of timber weatherboards.
- Compatible with any substrate – Recommended for timber, fibre cement, concrete, and metals.
- 100% moisture proof – Solves common problems with cracking, splitting, and moisture ingress.
Boss UltraPoxy is a high-performance epoxy filler specifically formulated for filling of nail holes in timber weatherboards where seasonal expansion, contraction, and moisture ingress may be present.
Quick facts:
Boss UltraPoxy is a superior 100% solids epoxy fairing & filling compound with exceptional bond strength to timber, fibre cement, metals & plastics. Measure out equal parts of resin & hardener by volume onto a broad-knife and mix slowly until colour is uniform. Allow 4 hours cure at a substrate temperature of 20°. Curing time is reduced with extra mixing. Do not use below 6°. Ensure full cure before sanding. No spot priming required.
Product Features:
- Pre-gelled – easy to mix and apply.
- Permanently flexible – withstands natural seasonal movement of timber.
- Handy 1 litre kit size, consists of 500ml hardener & 500ml resin. Mixing ratio 1:1.
- Will not shrink – expands slightly as it cures.
- No spot priming required prior to topcoats.
- 100% moisture proof.
- High impact resistance.
- Easy sanding.
Uses:
Boss UltraPoxy has been specifically designed for filling nail holes on timber weatherboards and other exterior timber profiles. Also useful in larger cavities, for example where rotten timber or knots have been removed, or where cracks & joints have opened. Can be used on a variety of other substrates including fibre cement, plastics, fibreglass, and metals. Check for any warranty issues with the substrate manufacturer before use. May not be suitable for use in cavities less than 3-4mm in width or depth. See Limitations below.
Notes:
The Boss UltraPoxy system does not behave similarly to polyester fillers like standard builders’ bog. It requires a minimum volume, temperature, and time period to reach full cure before sanding. See limitations below.
Limitations and Recommendations:
- May not reach full cure in holes smaller than 3-4mm in diameter and depth. A minimum mass is required to self-generate enough heat to complete the chemical curing process within a reasonable time. As a basic rule, a standard jolt head nail punched to a depth of 4mm will have a high enough volume to reach full cure at normal temperatures within a 4-hour time frame. Hotter days and higher volumes reduce cure time, colder days and lower volumes extend cure time. Application under 6 degrees is not recommended.
- Substrate temperature must be considered. Even when the atmosphere is warm, the substrate may remain cold, particularly in shaded areas. Cold substrates will extend cure time or may halt it altogether.
- Over-mixing or under-mixing will affect performance. Over-mixing will cause the filler to cure prematurely leaving insufficient time for application. Under-mixing will extend the cure time, or possibly prevent cure altogether. Mixing should be done slowly and deliberately until the two colours are uniformly blended. Hurried haphazard mixing should be avoided.
- Mixing ratio must be accurate. A ratio of 50/50 is optimal. Inaccurate ratios will result in imperfect curing.
- Some expansion may occur after sanding if full cure has not been achieved. Sanding prematurely is to be avoided. If the curing process is interrupted by a drop in temperature, it will restart when the temperature rises. Sanding generates heat and will restart the curing process resulting in further expansion of the product and requiring additional sanding to achieve a level surface. Wait until the temperature rises and do not sand until full cure has been achieved. Careful use of a heat gun may be helpful in slow-to-cure areas.
- May not be suitable for use with paint colours darker than LRV45%. Check the substrate manufacturers specification before deciding on colours. As a rule, colours darker than LRV45% are not recommended on timber substrates. Substrates painted with colours darker than the substrate’s recommended LRV limit may warp or expand, causing greater distortion and swelling of the filler than is aesthetically acceptable. Use of epoxy filler is not recommended in such circumstances. If in doubt, testing of a few holes with the desired colour is recommended prior to commencement of work to ensure aesthetic expectations are met.