Mipa 1K Etch Primer 1L Rapid Metal Filler. 1K Etch Primer Filler is the perfect product for spot repairs and sanded-through spots. It dries in a remarkable 15 minutes in the booth and only 45 minutes at ambient temperatures. It has very good adhesion properties. It has sufficient filling power to fill small surface defects and it sands beautifully. Perfect filler for bare metal. Comes supplied in a 1 litre MIPA container.