Blackfriar don't suggest one will reflect more than the other however, Blackfriar Professional Solar Reflective Paint Aluminium would usually be chosen to tackle a leaking roof so if it is just solar reflectivity that is required, assuming the roof in question is bare, aged felt then Blackfriar Professional Solar Reflective Paint White would be the one to go for.

It will go straight onto MDF but a sealer coat of Zinsser Bulls Eye 1-2-3 would be a good idea. If the MDF is for exterior use these paints will not prevent the MDF from swelling over time due to moisture absorption. The product can be sprayed but some HVLP sprayers may not be suitable. The paint is quite thick, we do not advise thinning more than 10% maximum with water.

This should be OK, however the product is water based and can’t be used at lower temperatures, i.e below 10°C. The product should take to the cured PU foam as well but couldn't guarantee this.

Yes, the data sheet states;

'Wooden Surfaces - All bare wooden surfaces should be clean and dry. Not recommended for door or window frames. Do not apply to previously painted wood unless all traces of old paint have been removed.'

If the paint is still wet, scoop up as much paint as you can using a dust pan or similar. Mop up using sand/ sawdust/ rags, avoid spreading the paint further. There will still be some paint impregnated into the surface, at this stage washing with warm water and a scrubbing brush will take it up. Don’t flood the area with water as you will just spread the paint further.

If the paint is dry a paint stripper will be required such as Blackfriar Professional Paint & Varnish Remover.

Blackfriar Professional Solar Reflective Paint White is not recommended for EPDM, however GacoPro Roof Coating is available in Solar Reflective White and is suitable for application to EPDM.

Blackfriar don’t have any figures for their Blackfriar Professional Solar Reflective Paint White in relation to this, it is a white paint that doesn’t absorb sunlight and therefore reduces the temperature of the substrate. They have never carried out specific tests to determine the reduction in surface temperature.

Yes, two coats are recommended by brush or roller.

No, we would instead recommend something like Coo-Var White Glass Shading.

No, for flat metal roofs that may be subject to ponding water we would instead recommend GacoPro Roof Coating which is available in Solar Reflective White or Light Grey.

Yes.

All surfaces should be clean and free of loose material and contamination. Remove all moss, lichen, fungal growth and other contaminants. Scrape off any loose paint. Surfaces can be slightly damp but they should not be wet. Priming is not necessary.

Apply with a brush or roller working the paint in any surface imperfections, two coats are recommended.

Assuming you wish to reflect light off the wall into your property to brighten it up a little this should be fine. We would recommend using the Solar Reflective White, not the Aluminium. We also assume the party wall is a standard masonry surface, if so the paint will be fine to go onto this with no specialist primers.

Blackfriar Professional Solar Reflective Paint isn't suitable for polycarbonate but Bedec Multi Surface Paint is suitable for the inside and Bedec Super-Flex is suitable for the outside. It's totally up to you which you prefer to use as both with be equally effective at reflecting the heat. Most commonly conservatories are done in white rather than aluminium as it will not darken the room as much.