TPR Systems RE 55 resin is a solvent-free high-viscosity 2-component reactive resin based on EP which is used prefer-ably as a barrier or insulating primer for synthetic resin-modifi ed cement substrates. TPR Systems RE 55 resin is absolutely essential as the fi rst primer on these substrates if the surface is to be given a further methacrylic resinbased coating.

In contrast to normal methacrylic resin primers, TPR Systems RE 55 resin is not subject to any hardening problems which may be caused by dispersant/emulsifying additives or other concrete additives, e. g. water-emulsifi able EP/PU coats. Other problematic contaminations such as rubber abrasion, carbon black additives in the substrate, remnants of carpet or tile adhesives and inhibiting epoxy resin hardeners in old coatings can be effectively primed with an insulating coat of TPR Systems RE 55 resin without any hardening problems being expected in the methacrylic coating.

Application

To ensure perfect adhesion with the subsequent coating, TPR Systems Filler QS 0.7 – 1.2 mm must be sprinkled liberally into the TPR Systems RE 55 resin until saturation before the resin cures. When curing is complete, the excess quartz sand is brushed or vacuumed away and the surface can then be given a top coat. Low viscosity coating recipes can be applied directly. Higher-viscosity or highly-fi lled mortar systems, on the other hand, require a further methacrylic intermediate primer coat of TPR Systems R 51, R 52 or RU 727 resin in order to close up any pores in the sprinkled sand so that no bub-bles form and no partial separation can occur.

Advice on application

TPR Systems RE 55 resin is supplied in two packing units (resin in a 20 kg hobbock and hardener in a 10 kg bucket).

To apply, mix the two components together intensively for about 2 – 3 minutes with an agitator unit in the prescribed ratio of 100 : 50.

The substrate must conform to the rules of the art, i. e. be dry and free of oil and dust, have suffi cient bearing and inherent strength for its use and be free of cementitious grout (shot/ball blasting, milling etc.). The mixed primer is poured onto the substrate and initially spread roughly by means of rubber blades. Then the primer is rolled into the substrate under slight pressure using standard Perlon rollers until the pores are completely closed up and TPR Systems Filler QS 0.7 – 1.2 mm is immediately sprinkled in liberally until saturation before the surface hardens. It may be necessary prime absorbent substrates again wet in wet before sprinkling the sand in. The pot life depends on the temperature and is generally around 20 minutes (+20 °C), while hardening takes some 6 – 8 hours (+20 °C). Only a perfectly hardened coat of TPR Systems RE 55 should be overlayed with the next layer. Under no circumstances may solvents be added to dilute or adjust the viscosity. Suitable solvents such as Silikal cleaning agents must be used to clean the tools. TPR Systems RE 55 resin has been adequately tested by TPR and released for use; it is currently in the introductory phase. However, this does not release the user from his duty of care, in particular to test the product and its application for suitability, particularly in combination with other products or systems.

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