Abrasives from 3M provide the perfect basis for best painting results. The portfolio includes grinding wheels and stripes, hand abrasive and wet abrasive. The right abrasives play a key role for a perfect result in vehicle refinishing. Whether in the preparation, in dry primer or fine sanding: Our quality abrasives and a further range of accessories are designed to help you safely and efficiently exercise your processes, especially...
In preparation for filler application, clean the repair area and remove all loose paint particles or rust. Sand down to bare, clean metal using Cubitron™ II 150+ on a DA sanding machine - to achieve the surface that you want to apply body filler onto.
Apply 3M Dry Guide Coat to highlight any 150+ scratches, then key the feather edge around the bare metal with Cubitron™ II 220+ to prevent that any solvents from the filler can penetrate the edges and lead to subsequent swelling.
Once the filler is cured, apply 3M Dry Guide Coat to show the filler structure and allow a controlled fast sanding. Dry Guide Coat also helps to reduce clogging and extends the live of the abrasive.
Use 3M Cubitron™ II 150+ by machine or with the right Handblock and dust extraction for a fast shaping of the filler area.
Re-apply 3M Dry Guide Coat to highlight any deeper scratches and surface imperfections to be removed with finer abrasives.
In order to prepare the surface for the primer application, reduce any scratches of 150+ by using grade 220+. To achieve optimal flattened results, use abrasive with a hand block.
Following the manual sanding, use a DA machine (Festool Automotive Systems LEX 150 / 5 or Festool Automotive Systems ETS / EC 150 / 15) and Cubitron™ II 220+, followed by P400 / P500 to featheredge and improve the adhesion of the primer.
Interim protect any surrounding edges with a strip of masking tape, before you prepare the blending area.
9a : Using 3M™ Flexible Abrasive Sheets P1000 - P1200 to prepare the edges and styling lines of the area that the base coat needs to be blended in.
9b : To prepare the whole blending area, use 3M P1000 abrasive (e.g. 260L+, Flexible Disc or Trizact™) with an interface pad on a DA machine.
9c : Using Scotch-Brite™ Disc Grey on a DA with dust extraction, clean the surface in preparation for a clean base coat application, wipe the surface clean with a 3M Panel Wipe and suitable degreaser, then mask the primer area as required.Apply and cure the primer of your choice, following your paint manufacturers recommendations.
To improve the adhesion of the primer, it is recommended to key the surrounding edge area with P400/P500.
Apply and cure the primer of your choice, following your paint manufacturers recommendations.
Apply Dry Guide Coat to the primer area to allow control of work progress.
The first step in primer sanding is done with 320+ / 400+ using 3M abrasive sheets on a hand block in central repair area above the filler to flatten the surface.
Re-apply Dry Guide Coat to the sanded area to to highlight scratches to be removed.
To avoid burn through with latter DA sanding, any edges and styling lines within the repair area are sanded by hand first, using Hookit™ Flexible Abrasive Sheets P1000.
Tip: Key is not to sand through the primer and open up bare metal again. If it has happened, please make sure you cover this area with the required thickness (paint manufacturer recommendation!). A badly treated area will show up with a darker coloured base coat and ultimately lead to contact corrosion.
Sand the surface now using Festool Automotive Systems LEX3 150 / 3 or Festool Automotive Systems EETS / EC 150 / 3, equipped with a soft back-up pad. Abrasive grade to be used is now 400+ / P500 to remove the structure of the previous primer application and leave the perfect surface for the base coat to be applied to.
For critical colours use a 3M™ Hookit™ Flexible Foam Abrasive Disc P600 as a last sanding step after 400+.
Inspect the replacement part - clean and degrease in accordance with paint company recommendations.
Working from the interior to the outside, use a Scotch Brite Grey (from Roll or as Hand Pad) to key the inner area of the part and around corners, edges and rims.
Sand the surface now using a DA machine with 3 mm throw, equipped with a soft back-up pad and an interface pad for additional buffering. The ideal abrasive for this process to be used is the special E-coat Disc 3M™ Hookit™ Abrasive Disc 337U, grade P320.
Using a Scotch-Brite™ Disc Grey on a DA with dust extraction, clean the surface in preparation for a clean primer application.
Final clean in accordance with paint company recommendations and apply the primer.