The repair process

Repair Process III

Part repair, damage and reconstruction of anticorrosion protection using epoxy primer

Repair Process III

1. Tools needed for the repair

  •  InterTroton or Master silicone remover
  • InterTroton or Master thinner for acrylic products
  • Sand paper (for the beginning, for dry) P120-P320, finishing P400-P500 (for dry) P800-P1200 (for wet) for the machine, grindstone, mechanical equipment (see the substrate preparation), containers to mix products
  • Varnish tape, paper, cover foil to protect a vehicle (parts which are not repaired), antistatic cloth
  • Japanese putty knives to apply polyester putty
  • InterTroton or Master putty
  • InterTroton or Master epoxy primer (used as anticorrosion and septal base)
  • InterTroton or Master acrylic primer
  • Base coat (colour)
  • InterTroton or Master clearcoat

2. Step by step process

Substrate preparation

  •  On a repaired part, do a thinner test (substrate preparation)
  • If the result is positive – remove old coating up to bare steel, if negative – you can follow next steps in the process
  • Remove dust using compressed air
  • Clean the repaired part (silicone remover)
  • Cover not repaired parts
  • Sand a damaged part starting from a sand paper P120 – P180, remove corrosion thoroughly mechanically or manually (see substrate preparation)

Epoxy primer application

  • Using compressed air, remove dust,
  • Clean the repaired part with silicone remover
  • Where steel is cleaned from corrosion in parts or the whole panel, apply InterTroton or Master epoxy primer (according to the Technical Data Sheet of a product)
  • Sand the epoxy primer in a part where polyester putty is to be applied (sand paper for dry P180-P220)

Putty application

  • Remove the rest of dust and pollution, using compressed air
  • Clean the repaired part with silicone remover
  • Apply polyester putty in two layers with a correct time of drying (according to the Technical Data Sheet of a product). If there is roughness, polyester putty with glass or carbon fibre should be applied first and then filling or finishing putty from InterTroton or Master brand.
  • Sand the putty with the sand paper P120-P180 at first, finishing with P220-P320

Epoxy primer application

  • Using compressed air, remove dust and pollution
  • Clean the repaired part with silicone remover
  • Cover not repaired part
  • Clean again with the silicone remover, after a thorough evaporation of the remover
  • Apply the same epoxy primer which was used earlier, use it as a divider-isolation in sanded places (putty-steel), after a correct time of drying, wet on wet or with sanding (according to the Technical Data Sheet of a product)

Acrylic primer application

  • Then apply InterTroton or Master acrylic primer, which was used earlier (according to the Technical Data Sheet of a product)
  • After hardening, sand with the sand paper P400-P500 (for dry sanding or manual) or P800-P1200 for wet (sanding the surface on wet, remember to remove water straight after sanding). We recommend sanding on dry.

Clearcoat application

  • After a correct time of base coat drying (see manufacturer’s Technical Data Sheet) (using antistatic cloth, wipe dust or impurities from the surface)
  • Apply clearcoat (1,5-2 layers for VHS clearcoats, 2 layers for MS, HS clearcoats), see Technical Data Sheet for using a product

3. Warning!

  • Use only original products recommended by a manufacturer
  • Follow Technical Data Sheets of a product
  • Dry processing of materials is recommended
  • During works, use personal protective clothing
  • Use IR infrared searchlight which is to speed up the drying process of materials
  • The temperature and moistness are crucial for products and the repair
  • On reactive primer, do not apply polyester products (putties, primers)


Use the products


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